3V lithium battery charger. 3v lithium battery charger

Simple Li-Ion Battery Charger Circuits – Using LM317, NE555, LM324

The following post explains a four simple yet a safe way of charging a Li-ion battery using ordinary ICs like LM317 and NE555 which can be easily constructed at home by any new hobbyist.

Although Li-Ion batteries are vulnerable devices, these can be charged through simpler circuits if the charging rate does not cause significant warming of the battery., and if the user does not mind a slight delay in the charging period of the cell.

For users who want Rapid charging of the battery, must not use the below explained concepts, instead they can employ one of these professional Smart designs.

Basic Facts about Li-Ion Charging

Before learning the construction procedures of a li-Ion Charger, it would be important for us to know the basic parameters concerned with the charging Li-Ion battery.

Unlike, lead acid battery, a Li-Ion battery can be charged at significantly high initial currents which can as high as the Ah rating of the battery itself. This is termed as charging at 1C rate, where C is the Ah value of the battery.

lithium, battery, charger

Having said this, it is never advisable to use this extreme rate, as this would mean charging the battery at highly stressful conditions due to increase in its temperature. A 0.5C rate is therefore considered as a standard recommended value.

0.5C signifies a charging current rate that’s 50% of the Ah value of the battery. In tropical summer conditions, even this rate can turn into an unfavorable rate for the battery due to the existing high ambient temperature.

lithium, battery, charger

Does Charging a Li-Ion Battery Require Complex Considerations?

Absolutely not. It’s actually an extremely friendly form of battery, and will get charged with minimal considerations, although these minimal considerations are essential and must be followed without fail.

A few critical but easy to implement considerations are: auto cut-off at the full charge level, constant voltage, and constant current input supply.

The following explanation will help to understand this better.

The following graph suggests the ideal charging procedure of a standard 3.7 V Li-Ion Cell, rated with 4.2 V as the full charge level.

Stage#1: At the initial stage#1 we see that the battery voltage rises from 0.25 V to 4.0 V level in around one hour at 1 amp constant current charging rate. This is indicated by the BLUE line. The 0.25 V is only for indicative purpose, an actual 3.7 V cell should never be discharged below 3 V.

Stage#2: In stage#2, the charging enters the saturation charge state, where the voltage peaks to the full charge level of 4.2 V, and the current consumption begins dropping. This drop in the current rate continues for the next couple of hours. The charging current is indicated by the RED dotted line.

Stage#3: As the current drops, it reaches its lowest level which is lower than 3% of the cell’s Ah rating.

Once this happens, the input supply is switched OFF and the cell is allowed to settle down for another 1 hour.

After one hour the cell voltage indicates the real State-Of-Charge or the SoC of the cell. The SoC of a cell or battery is the optimal charge level which it has attained after a course of full charging, and this level shows the actual level which can be used for a given application.

At this state we can say the cell condition is ready to use.

Stage#4: In situations where the cell is not used for long periods, a topping up charging is applied from time to time, wherein the current consumed by the cell is below 3% of its Ah value.

Remember, although the graph shows the cell being charged even after it has reached 4.2 V, that’s strictly not recommended during practical charging of a Li-Ion cell. The supply must be automatically cut off as soon as the cell reaches 4.2 V level.

So What does the Graph Basically Suggest?

  • Use an input supply which has a fixed current and fixed voltage output, as discussed above. (Typically this can be = Voltage 14% higher than printed value, Current 50% of the Ah value, lower current than this will also work nicely, although charging time will increase proportionately)
  • The charger should have an auto-cut off at the recommended full charge level.
  • Temperature management or control for the battery may not be required if the input current is restricted to a value which does not cause warming of the battery

If you don’t have an auto cut-off, simply restrict the constant voltage input to 4.1 V.

) Simplest Li-Ion Charger using a single MOSFET

If you are looking for a cheapest and the simplest Li-Ion charger circuit, then there cannot be a better option than this one.

A single MOSFET, a preset or trimmer and a 470 ohm 1/4 watt resistor is all that you would need to make a simple and safe charger circuit.

Before connecting the output to a Li-Ion cell make sure of a couple of things.

1) Since the above design does not incorporate temperature regulation, the input current must be restricted to a level which does not cause significant heating of the cell.

2) Adjust the preset to get exactly 4.1V across the charging terminals where the cell is supposed to be connected. A great way to fix this is to connect a precise zener diode in place of the preset, and replace the 470 ohm with a 1 K resistor.

For the current, typically a constant current input of around 0.5C would be just right, that is 50% of the mAh value of the cell.

Adding a Current Controller

If the input source is not current controlled, in that case we can quickly upgrade the above circuit with a simple BJT current control stage as shown below:

Advantage of Li-Ion Battery

The main advantage with Li-Ion cells is their ability to accept charge at a quick, and an efficient rate. However Li-Ion cells have the bad reputation of being too sensitive to unfavorable inputs such as high voltage, high current, and most importantly over charging conditions.

When charged under any of the above conditions, the cell may get too warm, and if the conditions persist, may result in leaking of the cell fluid or even an explosion, ultimately damaging the cell permanently.

Under any unfavorable charging conditions the first thing that happens to the cell is rise in its temperature, and in the proposed circuit concept we utilize this characteristic of the device for implementing the required safety operations, where the cell is never allowed to reach high temperatures keeping the parameters well under the required specs of the cell.

) Using LM317 as the Controller IC

In this blog we have come across many battery charger circuits using the IC LM317 and LM338 which are the most versatile, and the most suitable devices for the discussed operations.

Here too we employ the IC LM317, although this device is used only to generate the required regulated voltage, and current for the connected Li-Ion cell.

The actual sensing function is done by the couple of NPN transistors which are positioned such that they come in physical contact with the cell under charge.

Looking at the given circuit diagram, we get three types of protections simultaneously:

When power is applied to the set up, the IC 317 restricts, and generates an output equal to 3.9V to the connected Li-ion battery.

  • The 640 ohm resistor makes sure this voltage never exceeds the full charge limit.
  • Two NPN transistors connected in a standard Darlington mode to the ADJ pin of the IC controls the cell temperature.
  • These transistors also work like current limiter, preventing an over current situation for the Li-Ion cell.

We know that if the ADJ pin of the IC 317 is grounded, the situation completely shuts off the output voltage from it.

It means if the transistors conduct would cause a short circuit of the ADJ pin to ground causing the output to the battery shut off.

With the above feature in hand, here the Darlingtom pair does a couple of interesting safety functions.

The 0.8 resistor connected across its base and ground restricts the max current to around 500 mA, if the current tends to exceed this limit, the voltage across the 0.8 ohm resistor becomes sufficient to activate the transistors which chokes up the output of the IC, and inhibits any further rise in the current. This in turn helps keep the battery from getting undesired amounts of current.

Using Temperature Detection as the Parameter

However, the main safety function that’s conducted by the transistors is detecting the rise in temperature of the Li-Ion battery.

Transistors like all semiconductor devices tend to conduct current more proportionately with increase in the ambient or their body temperatures.

As discussed, these transistor must be positioned in close physical contact with the battery.

Now suppose in case the cell temperature begins rising, the transistors would respond to this and start conducting, the conduction would instantly cause the ADJ pin of the IC to be subjected more to the ground potential, resulting in decrease in the output voltage.

With a decrease in the charging voltage the temperature rise of the connected Li-Ion battery would also decrease. The result being a controlled charging of the cell, making sure the cell never goes into a run away situations, and maintains a safe charging profile.

The above circuit works with temperature compensation principle, but it does not incorporate an automatic over charge cut off feature, and therefore the maximum charging voltage is being fixed at 4.1 V.

Without Temperature Compensation

If you want to avoid the temperature controlling hassles, you can simply ignore the Darlington pair of BC547, and use a single BC547 instead.

Now, this will work only as a current/voltage controlled supply for the Li-Ion cell. Here’s the required modified design.

Since, here temperature control is not employed, make sure that Rc value is correctly dimensioned for a 0.5 C rate. For this you can use the following formula:

Suppose the Ah value is printed as 2800 mAh. Then the above formula could be solved as:

Rc = 0.7 / 1400 mA = 0.7 / 1.4 = 0.5 Ohms

Wattage will be 0.7 x 1.4 = 0.98, or simply 1 watt.

Likewise, make sure the 4k7 preset is adjusted to an exact 4.1 V across the output terminals.

Once the above adjustments are made, you can charge the intended Li-Ion battery safely, without worrying about any untoward situation.

Since, at 4.1 V we cannot assume the battery to be fully charged.

To counter the above drawback, an automatic cut off facility becomes more favorable than the above concept.

I have discussed many op amp automatic charger circuits in this blog, any one of them can be applied for the proposed design, but since we are interested to keep the design cheap and easy, an alternative idea which is shown below can be tried.

Employing an SCR for the Cut-Off

If you are interested to have an auto cut off only, without temperature monitoring, you can try the below explained SCR based design. The SCR is used across the ADJ and ground of the IC for a latching operation. The gate is rigged with the output such that when the potential reaches at about 4.2V, the SCR fires and latches ON, cutting of power to the battery permanently.

The threshold may be adjusted in the following manner:

Initially keep the 1K preset adjusted to ground level (extreme right), apply a 4.3V external voltage source at the output terminals. Now slowly adjust the preset until the SCR just fires (LED illuminated).

This sets the circuit for the auto shut off action.

How to Set-Up the Above Circuit

Initially keep the central slider arm of the preset touching the ground rail of the circuit.

Now, without connecting the battery switch ON power, check the output voltage which would naturally show the full charge level as set by the 700 ohm resistor.

Next, very skilfully and gently adjust the preset until the SCR just fires shutting off the output voltage to zero.

That’s it, now you can assume the circuit to be all set.

Connect a discharged battery, switch ON power and check the response, presumably the SCR will not fire until the set threshold is reached, and cut off as soon as the battery reaches the set full charge threshold.

lithium, battery, charger

) Li-Ion Battery Charger Circuit Using IC 555

The second simple design explains a straightforward yet precise automatic Li-Ion battery charger circuit using the ubiquitous IC 555.

Charging Li-ion Battery Can be Critical

A Li-ion battery as we all know needs to be charged under controlled conditions, if it’s charged with ordinary means could lead to damage or even explosion of the battery.

Basically Li-ion batteries don’t like over charging their cells. Once the cells reach the upper threshold, the charging voltage should be cut off.

The following Li-Ion battery charger circuit very efficiently follows the above conditions such that the connected battery is never allowed to exceed its over charge limit.

When the IC 555 is used as a comparator, its pin#2 and pin#6 become effective sensing inputs for detecting the lower and the upper voltage threshold limits depending upon the setting of the relevant presets.

Pin#2 monitors the low voltage threshold level, and triggers the output to a high logic in case the level drops below the set limit.

Conversely, pin#6 monitors the upper voltage threshold and reverts the output to low on detecting a voltage level higher than the set high detection limit.

Basically the upper cut off and lower switch ON actions must be set with the help of the relevant presets satisfying the standard specs of the IC as well as the connected battery.

The preset concerning pin#2 must be set such that the lower limit corresponds to 1/3rd of the Vcc, and similarly preset associated with pin#6 must be set such that the upper cut off limit corresponds to 2/3rd of Vcc, as per the standard rules of the IC 555.

How it Works

The entire functioning of the proposed Li-Ion charger circuit using IC 555 takes place as explained in the following discussion:

Let’s Assume a fully discharged li-ion battery (at around 3.4V) is connected at the output of the below shown circuit.

Assuming the lower threshold to be set somewhere above the 3.4V level, pin#2 immediately senses the low voltage situation and pulls the output high at pin#3.

The high at pin#3 activates the transistor which switches ON the input power to the connected battery.

The battery now gradually begins charging.

As soon as the battery reaches full charge (@4.2V), assuming the upper cut off threshold at pin#6 to be set at around 4.2v, the level is sensed at pin#6 which immediately reverts the output to low.

The low output instantly switches off the transistor which means the charging input is now inhibited or cut off to the battery.

The inclusion of a transistor stage provides the facility of charging higher current Li-Ion cells also.

The transformer must be selected with voltage not exceeding 6V, and current rating 1/5th of battery AH rating.

Circuit Diagram

If you feel that the above design is much complex you could try the following design which looks much simpler:

How to Set up the Circuit

Connect a fully charged battery across the shown points and adjust the preset such that the relay just deactivates from N/C to N/O position. do this without connecting any charging DC input to the circuit.

Once this is done you can assume the circuit to be set and usable for an automatic battery supply cut off when fully charged.

During actual charging, make sure the charging input current is always lower than the battery AH rating, meaning if suppose the battery AH is 900mAH, the input should not be more than 500mA.

The battery should be removed as soon as the relay switches OFF to prevent self discharging of the battery via the 1K preset.

All resistors are 1/4 watt CFR


Although the designs presented above are all technically correct and will perform the tasks as per the proposed specifications, they actually appear as an overkill.

A simple yet effective and safe way to charge a Li-Ion Cell is explained in this post, and this circuit may be applicable to all forms of batteries since it perfectly takes care of two crucial parameters: Constant-Current and full charge auto cut-off. A constant voltage is assumed to be available from the charging source.

) Charging Many Li-Ion Batteries

The article explains a simple circuit which can be used for charging at least 25 nos of Li-Ion cells in parallel together quickly, from a single voltage source such as a 12V battery or a 12V solar panel.

The idea was requested by one the keen followers of this blog, let’s hear it :

Charging many Li-ion Battery Together

Can you help me design a circuit to charge 25 li-on cell battery (3.7v- 800mA each) at the same time. My power source is from 12v- 50AH battery. Also let me know how many amps of the 12v battery would be drawn with this setup per hour. thanks in advance.

The Design

When it comes to charging, Li-ion cells require more stringent parameters compared to lead acid batteries.

This becomes especially crucial because Li-ion cells tend to generate considerable amount of heat in the course of the charging process, and if this heat generation goes beyond control may lead serious damage to the cell or even a possible explosion.

However one good thing about Li-ion cells is that they can be charged at full 1C rate initially, contrary to lead acid batteries which doesn’t allow more than C/5 charging rate.

The above advantage permits Li-ion cells to get charged at 10 times faster rate than the lead acid counter part.

As discussed above, since heat management becomes the crucial issue, if this parameter is appropriately controlled, the rest of the things become pretty simple.

It means we can charge the Li-ion cells at full 1C rate without being bothered about anything as long as we have something which monitors the heat generation from these cells and initiates the necessary corrective measures.

I have tried to implement this by attaching a separate heat sensing circuit which monitors the heat from the cells and regulates the charging current in case the heat starts deviating from safe levels.

Controlling Temperature at 1C Rate is Crucial

The first circuit diagram below shows a precise temperature sensor circuit using the IC LM324. Three of its opamps have been employed here.

The diode D1 is a 1N4148 which effectively acts as the temperature sensor here. The voltage across this diode drops by 2mV with every degree rise in temperature.

This change in the voltage across D1 prompts A2 to change its output logic, which in turn initiates A3 to gradually increase its output voltage correspondingly.

The output of A3 is connected to an opto coupler LED. As per the setting of P1, A4 output tends to increase in response to the heat from the cell, until eventually the connected LED lights up and the internal transistor of the opto conducts.

When this happens the opto transistor supplies the 12V to the LM338 circuit for initiating the necessary corrective actions.

The second circuit shows a simple regulated power supply using the IC LM338. The 2k2 pot is adjusted to produce exactly 4.5V across the connected Li-ion cells.

The preceding IC741 circuit is an over charge cut off circuit which monitors the charge over the cells and disconnects the supply when it reaches above 4.2V.

The BC547 at the left near the ICLM338 is introduced for applying the appropriate corrective actions when the cells begin getting hot.

In case the cells begin getting too hot, the supply from the temperature sensor opto coupler hits the LM338 transistor (BC547), the transistor conducts, and instantly shuts off the LM338 output until the temperature comes down to normal levels, this process continues until the cells get fully charged when the IC 741 activates and disconnects the cells permanently from the source.

In all 25 cells may be connected to this circuit in parallel, each positive line must incorporate a separate diode and a 5 Ohm 1 watt resistor for equal distribution of charge.

The entire cell package should be fixed over a common aluminum platform so that the heat is dissipated over the aluminum plate uniformly.

D1 should be glued appropriately over this aluminum plate so that the dissipated heat is optimally sensed by the sensor D1.

Automatic Li-Ion Cell Charger and Controller Circuit.

  • The basic criteria that needs to be maintained for any battery are: charging under convenient temperatures, and cutting off the supply as soon as it reaches the full charge. That’s the basic thing you need to follow regardless of the battery type. You can monitor this manually or make it automatic, under both cases your battery will charge safely and have a longer life.
  • The charging/discharging current is responsible for the temperature of the battery, if these are too high compared to the ambient temperature then your battery will suffer heavily in the long run.
  • Second important factor is never allowing the battery to discharge heavily. Keep restoring the full charge level or keep topping it up whenever possible. This will ensure that the battery never reaches its lower discharge levels.
  • If you find it difficult to monitor this manually then you can go for an automatic circuit as described on this page.

Have further doubts? Please let them come through the comment box below

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Lithium-Ion Battery Circuitry Is Simple

By now, we’ve gone through LiIon handling basics and mechanics. When it comes to designing your circuit around a LiIon battery, I believe you could benefit from a cookbook with direct suggestions, too. Here, I’d like to give you a collection of LiIon recipes that worked well for me over the years.

I will be talking about single-series (1sXp) cell configurations, for a simple reason – multiple-series configurations are not something I consider myself as having worked extensively with. The single-series configurations alone will result in a fairly extensive writeup, but for those savvy in LiIon handling, I invite you to share your tips, tricks and observations in the comment section – last time, we had a fair few interesting points brought up!

The Friendly Neighborhood Charger

There’s a whole bunch of ways to charge the cells you’ve just added to your device – a wide variety of charger ICs and other solutions are at your disposal. I’d like to FOCUS on one specific module that I believe it’s important you know more about.

You likely have seen the blue TP4056 boards around – they’re cheap and you’re one Aliexpress order away from owning a bunch, with a dozen boards going for only a few bucks. The TP4056 is a LiIon charger IC able to top up your cells at rate of up to 1 A. Many TP4056 boards have a protection circuit built in, which means that such a board can protect your LiIon cell from the external world, too. This board itself can be treated as a module; for over half a decade now, the PCB footprint has stayed the same, to the point where you can add a TP4056 board footprint onto your own PCBs if you need LiIon charging and protection. I do that a lot – it’s way easier, and even cheaper, than soldering the TP4056 and all its support components. Here’s a KiCad footprint if you’d like to do that too.

This is a linear charger IC – if you want 1 A out, you need 1 A in, and the input-output voltage difference multiplied by current is converted into heat. Thankfully, the TP4056 modules are built to handle high temperatures reasonably well, and you can add a heatsink if you want. Maximum charging current is set by a resistor between ground and one of the pins, default resistor being 1.2 kΩ resulting in 1 A current; for low-capacity cells, you can replace it with a 10 kΩ resistor to set a 130 mA limit, and you can find tables online for intermediate values.

There’s some cool things about the TP4056 IC that most people don’t know about if they’re using the modules as-is. The IC’s CE pin is hardwired to 5 V VIN, but if you lift that pin, you can use it to disable and enable charging with a logic level input from your MCU. You can monitor the charging current by connecting your MCU’s ADC to the PROG pin – the same pin used for the current setting resistor. There’s also a thermistor pin, typically wired to ground, but adaptable for a wide range of thermistors using a resistor divider, whether it’s the thermistor attached to your pouch cell or one you added externally to your 18650 holder.

There’s problems with the TP4056 too – it’s a fairly simple IC. Efficiency isn’t an imperative where wall power is available, but the TP4056 does waste a decent bit of power as heat. A switching charger-based module avoids that, and often also lets you charge at higher currents if ever required. Connecting a cell in reverse kills the chip, and the protection circuit too – this mistake is easy to make, I’ve done that aplenty, and this is why you need spares. If you reverse the cell contacts, throw the board out – don’t charge your cells with a faulty IC.

Also, given the TP4056’s popularity, copies of this IC are manufactured by multiple different chip vendors in China, and I’ve observed that some of these copy ICs break more easily than others, for instance, no longer charging your cells – again, keep spares. The TP4056 also doesn’t provide charging timers like other, more modern ICs do – a subject we touched upon in the comment section of the first article.

All in all, these modules are powerful and fairly universal. It’s even safe to use them to charge 4.3 V cells, as due to the CC/CV operation, the cell simply won’t charge to its full capacity – prolonging your cell’s life as a side effect. When you need to go beyond such modules, there’s a myriad of ICs you can make use of – smaller linear chargers, switching chargers, chargers with built-in powerpath and/or DC-DC regulator features, and a trove of ICs that do LiIon charging as a side effect. The world of LiIon charger ICs is huge and there’s way more to it than the TP4056, but the TP4056 is a wonderful starting point.

The Protection Circuit You Will See Everywhere

Just like with charging ICs, there’s many designs out there, and there’s one you should know about – the DW01 and 8205A combination. It’s so ubiquitous that at least one of your store-bought devices likely contains it, and the TP4056 modules come with this combo too. The DW01 is an IC that monitors the voltage of your cell and the current going to and from it, and the 8205A is two N-FETs in a single package, helping with the actual “connect-disconnect the battery” part. There’s no additional current sensing resistor – instead, the DW01 monitors voltage across the 8205A junction. In other words, the same FETs used to cut the cell from the outside world in case of failure, are used as current sensing resistors. This design is cheap, prevalent, and works wonders.

The DW01 protects from overcurrent, overdischarge and overcharge – the first two happen relatively often in hobby projects, and that last one’s handy if your charger ever goes rogue. If something wrong happens, it interrupts the connection between the cell’s negative terminal and GND of your circuit, in other words, it does low-side switching – for a simple reason, FETs that interrupt GND are cheaper and have lower resistance. We’ve also seen some hacks done with this chip – for instance, we’ve covered research from a hacker who figured out that the DW01 can be used as a soft power switch for your circuit – in a way that doesn’t compromise on safety. You only need to connect a GPIO pin of your MCU to the DW01, preferably through a diode – this comment describes an approach that seems pretty failure-resistant to me.

When you first connect a LiIon cell to the DW018205A combination, sometimes it will enable its output, but sometimes it won’t. For instance, if you have a holder for 18650s and a protection circuit connected to it, it’s a 50/50 chance that your circuit will power up once you insert the battery. The solution is simple – either connect a charger externally, or short-circuit the OUT- and B- with something metal (I often add an external button), but it’s annoying to deal with. Just like TP4056, the DW018205A combo dies if you connect the battery in reverse. Also, the DW01 is internally wired for 2.5 V overdischarge cutoff, which technically isn’t changeable. If you don’t have a separate software-controlled cutoff, the FS312 is a pin-compatible DW01 replacement with 3.0 V overdischarge point, helping you prolong your cell’s life.

You can buy a batch of ready-to-go protection circuit modules, or just use the protection circuit laid out on the TP4056 module PCB. You can also accumulate a decent stock of protection circuits by taking them out of single-cell batteries whenever the cell puffs up or dies – take caution not to puncture the cell while you do it, please.

All The Ways To Get 3.3 V

For a 4.2 V LiIon cell, the useful voltage range is 4.1 V to 3.0 V – a cell at 4.2 V quickly drops to 4.1 V when you draw power from it, and at 3.0 V or lower, the cell’s internal resistance typically rises quickly enough that you will no longer get much useful current out of your cell. If you want to get to 1.8 V or 2.5 V, that is not a problem, and if you want to get to 5 V, you’ll use a boost regulator of some sort. However, most of our chips still run at 3.3 V – let’s see what our options are here.

When it comes to LiIon range to 3.3 V regulation, linear regulators closely trail switching regulators in terms of efficiency, often have lower quiescent (no-load) current if you seek low-power operation, and lower noise if you want to do analog stuff. That said, your regular 1117 won’t do – it’s an old and inefficient design, and the 1117-33 starts grinding its gears at about 4.1 V. Instead, use pin-compatible, low dropout voltage replacements like AP2111, AP2114 and BL9110, or AP2112, MIC5219, MCP1700 and ME6211 if you’re okay with SOT23 stuff. All of these are linear regulators comfortable providing 3.3 V with input down to 3.5 V and sometimes even 3.4 V, if you’d like to power something like an ESP32. It’s hard to deny the simplicity of using a linear regulator – one chip and a few caps is all it takes.

If you want 500 mA to 1000mA or even more current on an ongoing basis, a switching regulator will be your best friend. My personal favourite is PAM2306 – this regulator is used on the Raspberry Pi Zero, it’s very cheap and accessible, and even has two separate output rails. Given its capability to do 100% duty cycle operation, it can extract a lot of juice out of your cells, often desirable for higher-power projects where runtime matters. And hey, if you got Pi Zero with a dead CPU, you won’t go wrong snipping a part of the PCB off and soldering some wires to it. When designing your own board, use datasheet recommendations for inductor parameters if the whole “picking the right inductor” business has you confused.

So, the PAM2306 is the regulator on the Pi Zero, and it’s also LiIon-friendly? Yep, you can power a Pi Zero directly from a LiIon battery, as all the onboard circuitry works down to 3.3 V on the “5 V” pins. I’ve tested it extensively in my own devices, and it even works with the Pi Zero 2 W. Combined with this powerpath and a charger, you have a complete “battery-powered Linux” package, with all the oomph that a Raspberry Pi provides – at cost of only a handful of components. One problem to watch out for is that MicroUSB port VBUS will have battery voltage – in other words, you’re best off filling the MicroUSB ports with hot glue just in case someone plugs a MicroUSB PSU there, and tapping the USB data testpoints for USB connectivity.

A Power Path To Join Them All

Now, you’ve got charging, and you got your 3.3 V. There’s one problem that I ought to remind you about – while you’re charging the battery, you can’t draw current from it, as the charger relies on current measurements to control charging; if you confuse the charger with an extra load, you risk overcharging the battery. Fortunately, since you have a charger plugged in, you must have 5 V accessible. It’d be cool if you could power your devices from that 5 V source when it’s present, and use the battery when it’s not! We typically use diodes for such power decisions, but that’d cause extra voltage drop and power losses when operating from the battery. Thankfully, there’s a simple three-component circuit that works way better.

In this power path circuit, a P-FET takes role of one of the diodes, with a resistor opening the FET while the charger’s not present. The P-FET doesn’t have a voltage drop, but instead has resistance in fractions of an ohm, so you avoid losses when the charger’s not plugged in. Once the charger is connected, the FET closes, and the charger powers your circuit through the diode instead. You need a logic-level P-FET – IRLML6401, CJ2305, DMG2301LK or HX2301A would fit, and there’s thousand others that will work. As for a diode, a default Schottky like 1N5819 (SS14 for SMD) will do. It’s a ubiquitous circuit and deserves its place in circuit toolboxes.

You can buy shields and modules that contain all of these parts and sometimes more, on a single board. You can also buy ICs that contain all or some of the parts of this circuit, often improved upon, and not worry about the specifics. These ICs tend to be more expensive, however, and way more subject to chip shortages than the individual component-based solution. Plus, when issues arise, understanding of inner workings helps a whole lot. Thus, it’s important that the basics are demystified for you, and you don’t feel forced into reusing powerbank boards next time you want to make a device of yours portable.

Be on the lookout on what other boards are doing. Often, you’ll see the charger regulator powerpath circuit described above, especially when it comes to cheaper boards with chips like the ESP32. Other times, you’ll see more involved power management solutions, like powerbank chips or PMICs. Sometimes they’re going to work way better than the simple circuit, sometimes it’s the opposite. For instance, some TTGO battery-powered boards use powerbank chips and overcomplicate the circuit, resulting in weird behaviour and malfunctions. A different TTGO board, on the other hand, uses a PMIC that’s way more suited for such boards, which results in flawless operation and even granular power management control for the user.

Hack Portable Devices Like You Couldn’t Before

Now you know what it takes to add a LiIon battery input connector to your project, and the secrets behind the boards that come with one already. It’s a feeling like no other, taking a microcontroller project with you on a walk as you test out a concept of yours. I hope I got you a bit closer to experiencing it.

Next time, I’d like to talk about batteries with multiple cells in series – BMSes, balancing and charging LiIon packs from different sources. That, however, will take a good amount of time for me to prepare, as I’d like to finish a few related projects first, and I recommend you check this coverage of ours out if you’d like to learn about that. In the meantime, I wish you luck in building your battery-powered projects!

Posted in Battery Hacks, Featured, Interest, Slider Tagged 18650, batteries, battery, how-to, lithium ion

Table of Contents

  • When Is a 9V Battery Dead?
  • Can 3.7V Device Run-Off 9V Battery?
  • What Are The Best 9V Batteries With Charger?
  • Will You Ever Die From Licking 9V Batteries?

9V batteries are one of the big 5 or highly in-demand batteries because of the many applications or devices they can power up. Each 9-volt battery is literally described as a rectangular prism cell having rounded edges and a polarized snap connector at its top. It has product dimensions of approximately 46.40 mm to 48.50 mm in height; 25.0 mm to 26.50 mm approximate length and a width ranging from 15.0 mm to 17.50 mm. It is first used in transistor radios. This is the reason why some manufacturers still refer to the nine-volt batteries as transistor batteries.

V Batteries: Types And Chemistries To Consider

A 9V battery comes in two basic types. These are primary 9V batteries and 9-volt rechargeable batteries. The primary ones have different chemistries or compositions. Rechargeable batteries are also made of various chemical compositions with slight differences in some features. Primary cells are either alkaline batteries, Lithium, zinc-air, Zinc chloride, silver oxide, and other variants. On the other hand, rechargeable 9-volt batteries are made up of such chemistries as rechargeable alkaline batteries, Lithium-ion, Lithium Iron Phosphate (LiFePO4), Lithium Manganese Oxide (LiMn2O4), Lithium Titanate (Li2TiO3), Lithium Nickel Manganese Cobalt Oxide

(LiNiMnCoO2), Lithium Cobalt Oxide (LiCoO2), Nickel Cadmium (NiCad), Nickel Metal Hydride (NiMH), Lead Acid. Different chemistries have different characteristics. This affects the performance and compatibility with your chosen devices.

Primary Batteries

Primary batteries are mostly composed of 9V lithium and alkaline batteries from such brands as Energizer, Duracell Batteries, Procell, Varta, Ansmann, Ultralife, Stryka, Fujitsu, Panasonic, Master, Mi Battery Experts, Philips, GP, Vinnic, Kaba Ilco Unican, and many others. Popular and long-lasting 9V alkaline batteries include Energizer MAX Plus Advanced 9V, Energizer MAX 9V, Duracell Batteries (9V), GP29A 9V, Ansmann 9V, Varta High Energy Alkaline Batteries 9V, Duracell Coppertop 9V, Panasonic 6LR61T Industrial Grade 9V, Fujitsu Universal Power 6LF22 9V size alkaline battery, Mi 9V Alkaline batteries, A136 9V Alkaline Battery, and 9V 120mAh Alkaline Battery. Long-lasting Lithium batteries include Ultralife 9V Lithium battery, Heartstart FRx-OnSite-HS1 Battery (M5070A), and Ultralite 9V Lithium Smoke Alarm Battery.

Primary 9-Volt batteries are usually sold in blister packs either solo or a single piece and in packs of 2, 4, or even 10. These are also available in boxes of 12, 24, 28, or bigger boxes of 72 or more and have various options labeled as bulk batteries. These have varying based on brand, bulk pricing plans, and other specific battery requirements. Primary alkaline batteries last for four hours while Lithium disposable batteries last as twice as that of alkaline. This means that Lithium primary batteries can last for up to 10 hours or even more as some expensive brands claim.

Rechargeable 9V Battery

A rechargeable 9V battery comes in two size variations. These are the PP3 and PP9. The nine-volt battery rechargeable size variations exist to allow higher charge capacities, whenever required. Long-lasting rechargeable nine-volt batteries include Ansmann 9V E Type 300mAh NiMH LSD, VARTA Ready 2 Use 200mAh 9V Ni-MH Battery, and many other popular products. Energizer has a wide range of 9V rechargeable batteries. Eneloop, Power, Tenergy, and other leading brands also manufacture rechargeable batteries that are even sold with chargers in a pack. Some rechargeable nine-volt batteries are sold in blister packs of one or more cells. Others are also available in stores with their respective chargers so consumers will find it more convenient to have these nine-volt battery chargers ready whenever their initial charge wears off. Another option is that you can buy 9V in bulk. Depending on the manufacturer, direct supplier, or battery wholesaler, these bulk batteries come in various bulk pricing plans to suit any specific battery capacity requirements and aesthetic preferences.

Common Nine Volt Battery Applications

A nine-volt battery, either disposable or rechargeable, is usually used in smoke alarms, smoke detectors, walkie-talkies, transistor radios, test and instrumentation devices, medical batteries, LCD displays, and other small portable appliances. Nine-volt batteries are also ideally used in patient monitors, monitoring devices, emergency beacons, data recorders, surgical lighting, and other medical devices, equipment, and instrumentation. 9V’s are not just commonly used in the healthcare industry but are also popular in manufacturing, contracting, commercial properties, education, hospitality, or any other sector from a global perspective because of their battery capacity.

Other 9V Battery Facts Explained

A 9V Battery is not exactly 9V in voltage. A nine-volt battery is the standard battery size and shape, not the actual voltage or nominal voltage itself. Some of these batteries have working voltages ranging from 6.5V. 8.4V. Only 9V alkaline batteries have a voltage that is exactly 9 volts. In the case of rechargeable batteries, the voltage may come even lower or higher than this range. This depends on the 9V cell chemistry. Rechargeable nine-volt batteries may have a nominal voltage of 7.2V, 7.4V, 8.4V, 9.6V. The difference in voltage also varies on the 9V battery model.


A 9V-type battery that has different working voltages also have some minor differences in performance. A 9.6V NiMH nine-volt battery is rare but provides good performance and runtime. A working voltage of 9.6V is achieved using eight cells with 1.2V each.

The 8.4V NiMH battery will also do well but not so good with power-hungry or high drain devices compared to 9.6V. This working voltage is achieved by putting together seven 1.2V cells.

9V cells with either NiMH or lithium chemistry also performs better at 7.2V working voltage. This working voltage is achieved by using two 3.6V cells. Li-ion batteries have a nominal voltage of 3.6V and 3.7V.

Rechargeable nine-volt batteries usually come in two options: these are NiMH and Lithium. Lithium batteries double the NiMH capacity. NiMH’s 9V battery capacity last for about four hours with the rechargeable Lithium lasts for 7 to 7.5 hours.

9V rechargeable batteries usually come with a special charger as these are not compatible with universal chargers or any other battery charger. Most 9V batteries are sold in the market along with corresponding battery chargers in a pack. One advantage of getting these battery packs with chargers is that it can save you time and help to optimize your batteries as well as the performance of your devices or equipment since these are compatible products.

DIY 9V Battery Pack

Get a battery holder that can hold up to eight cells. Place 8 NiMH batteries into it. Finally, attach a 9V battery connector to the loaded holder. Now, you have the DIY 9V battery pack. Your very own 9V battery pack offers more run time compared to the standard size 9V battery.

The Bottom Line

A 9V battery is used in many applications requiring a greater amount of power than other devices. A nine-volt battery pack usually comes with a charger that makes it easier for consumers to instantly charge anytime they need to. These standard cells serve various applications and devices. As with any other battery size, it is important to note the differences in chemistries that affects cell performance and other features.


When Is a 9V Battery Dead?

The answer here depends on the device you are powering up. Different devices have different voltage requirements. In the case of 9V batteries used in smoke alarms, smoke alarms start functioning between 6V to 7.6V. If the voltage falls under 6V for this device, then a particular 9V battery is considered dead.

Can 3.7V Device Run-Off 9V Battery?

Some devices are indeed voltage-sensitive. So, if you have a 3.7V device and try to use a 9V battery on it for power, it can fry your device. The concept here is so simple. A 9V battery is different from a 3.7V battery or 3.7V battery-powered device. Using 9V batteries on 3.7V devices is more dangerous in electronic devices while it is less dangerous on motors.

What Are The Best 9V Batteries With Charger?

Recent reviews have rated the top 3 9V rechargeable battery packs with charger. These include LP 9V Rechargeable Battery Pack that with a micro-USB charger, EBL 9v 5-Pack Batteries with Charger, and Tenergy 9V Rechargeable Battery Pack with 2 Bay 9V Charger. LP 9V battery with charger pack is favoured by many users due to increased portability and accessibility since it uses a micro-USB charger. Another reason is that these are Li-ion 9V batteries with long lasting battery life and max performance than NiMH. The only drawback here is the price since Li-ion battery price is usually higher than NiCad and NiMH. Tenergy 9V battery/charger pack and EBL 9V 5-pack batteries with charger are both of NiMH battery chemistry. One advantage of the EBL pack is that its charger can charge all 5 batteries at once. Another thing is that its technical MCU controls enable fast charging in a consistent manner without getting these batteries too hot. This charger is proven safe and reliable, giving you optimised cells for enhanced device performance. Tenergy battery/charger pack is also NiMH. It has an integrated microprocessor control unit that monitors potential problems. This quick charger is 100% safe and will not burn your hands as it never gets beyond 40°C.

How Long Does a 9V Battery Last?

The most used types of 9V batteries are lithium and alkaline. Lithium types, like Lithium-Ion, last significantly longer than alkaline. However, alkaline is much cheaper.

In addition, its battery life depends on the type of cell that was used as each one have a different battery capacity (e.g., Lithium-Ion, Alkaline, Nickel Metal Hydride). If you want to be more specific, determine how long a 9V-type battery will last here.

On the other hand, devices like smoke detectors that use 9v alkaline can last 1 to 2 years while lithium batteries may last up to 5 years.

For reference, here are the technical specifications of a 9V battery:

Will You Ever Die From Licking A 9V Battery?

No, though you may have heard about folks dying for licking 9V batteries. The logic is plain and simple. A 9V battery current entering the body does not have much power as the electric shock that passes the heart resulting in arrhythmia and eventually death. Licking or sticking these into your tongue will not kill a person.

Where To Buy A 9V Battery

9V cells at HBPlus Battery Specialists are highly reliable power solutions for suitable applications. If you are in search of unbeatable products in both quality and price, The Battery Specialists is your one-stop shop. It even offers bulk pricing options for bulk batteries (such as Energizer and Duracell Batteries) and wholesale batteries with the best deals and exceptional quality in the market. Contact us now!

Can You Recharge CR2032 Batteries?

If you have a battery-powered device that uses CR2032 batteries, you may be wondering if it is possible to recharge them.

The CR2032 is a tiny battery used in a variety of devices, such as car key fobs, calculators, small flashlights, and so forth [1].

The short answer is yes, you can recharge CR2032 batteries. However, there are a few things to keep in mind before you do so.

For one, not all CR2032 batteries are rechargeable. If your device came with non-rechargeable batteries, it is best to stick with those. Rechargeable batteries may not last as long as non-rechargeable ones and they may also require special care when charging.

Secondly, even if your CR2032 batteries are rechargeable, it is important to consult your device’s manual before attempting to recharge them. This is because some devices are not designed to work with rechargeable batteries and could be damaged by attempts to do so.

In the following blog post, our tech-savvy experts will explore the answer to that question and provide some tips on how to recharge CR2032 batteries.

A Deeper Look At CR2032 Batteries

A CR2032 battery is a type of lithium-ion cell battery utilized inside electronic devices. These batteries are frequently found in tiny electronics, such as calculators, watches, cameras, camcorders, electronic games, and personal digital assistants. Even some hearing aids and keyless entry systems for automobiles use CR2032 batteries.

Lithium-ion batteries like the CR2032 are different from older types of batteries in that they can be recharged. In fact, you can recharge a CR2032 battery up to 500 times before it needs to be replaced.

  • First, you need to use a CR2032 battery charger specifically designed for lithium-ion batteries. You can’t use a standard NiCd or NiMH battery charger, as this could damage the battery;
  • Second, you should only recharge the battery when it is completely discharged. Recharging a partially discharged CR2032 battery can shorten its lifespan;

CR2032 Battery Specifications

The chemical composition of the battery is represented by the first letter, “C”, which stands for Chromium (however, while that was the initial make-up, CR batteries may now be manufactured from a variety of different elements, with Lithium being the most prevalent).

The next two digits in the sequence (in this case, “2” and “0”), tell us the coin’s diameter in millimeters. This particular battery has a diameter of 20mm.

The last two digits, “3” and “2”, represent the batter’s height in millimeters. But to get the height, divide the number by 10 first.

This means that the height of 3.2 millimeters is 32 divided by 10.

So, the “CR” in the name designates the battery’s chemistry, while the “2032” refers to its diameter and height (in millimeters). While CR2032 batteries are not rechargeable, there are some alternative battery types that can be recharged.

For example, 18650 lithium-ion batteries are larger than CR2032s but can be recharged up to 700 times. If you need a rechargeable option for your device, consider switching to a different type of battery altogether [2].

CR2032 Battery Voltage And Current Capacity Ratings

A voltage is required for all electrical and electronic devices to function. The device may as well be a paperweight if no electricity is supplied. The CR2032 has a voltage range of 3 to 3.7 volts.

The second feature is current capacity, which is measured in watts and indicates the battery’s total storage capacity (much like how much water a bottle can hold if water is the current).

Larger batteries are often labeled in Amp-Hours (Ah), while smaller batteries (such as CR2032 coin cell batteries) have their capacities listed in Milliampere-Hours (mAh). The CR2032 has a current capacity of between 230 and 1400 milliamperes [3].

To put that into perspective, a CR2032 battery can hold enough current to power a small electronic device for about an hour or two.

In general, higher voltage and current capacities mean that the battery will last longer before it needs to be recharged. But this also means that the battery will be larger and more expensive.

If you need a long-lasting battery for your device, consider opting for a higher voltage and capacity model. Otherwise, a CR2032 should suffice.

Are CR2032 Primary Or Secondary Batteries?

There’s some confusion about whether CR2032 batteries are primary or secondary cells.

Primary batteries can’t be recharged and must be thrown away after use. Secondary batteries can be recharged over and over again.

So, which category do CR2032 batteries fall into? The answer is that it depends on the specific battery in question.

Some CR2032 batteries are designed to be used once and then thrown away. These are primary cells and cannot be recharged.

Other CR2032 batteries are designed to be rechargeable. These secondary cells can be charged using a special charger (you can’t just use a regular AA battery charger).

Can You Recharge CR2032 Batteries?

When recharging a CR2032 battery, you can only recharge the rechargeable type because they are designed to be charged and utilized multiple times. LIR2032 is the name of the rechargeable version of the CR2032.

The letter “LI” is a chemical sign for Lithium-Ion, which is the most frequent chemical in rechargeable batteries.

You may not attempt to charge a non-rechargeable battery as doing so is dangerous and might result in an explosion.

How To Check If A CR2032 Can Be Charged Or Not?

If you have a CR2032 battery, the best way to check if it can be charged or not is to look for a label on the battery.

The label should say “Do Not Charge” or something similar. If the label does not say anything about charging, then the battery is probably not rechargeable.

Another way to tell if a CR2032 battery is rechargeable is by looking at the color of the positive and negative terminals.

If the positive and negative terminals are different colors, then the battery is probably not rechargeable.

Do Rechargeable CR2032 Batteries Require Special Chargers?

Yes, you’ll need special coin battery charging gear that can handle CR2032 batteries, particularly the CR2032 battery size. Because rechargeable CR2032 batteries are built of Lithium-Ion, they require even greater attention when it comes to charging.

When a battery has reached full charge, most battery chargers provide trickle charging. When a Lithium-Ion battery has fully charged, though, it is unable to accept any more charge.

As a result, when the battery has arrived at full capacity, the charger immediately cuts off the charging process.

This is why you’ll need a CR2032 coin cell battery charger that has an automatic shut-off function to prevent overcharging.

These types of chargers are readily available online and in many stores.

When shopping for a CR2032 coin cell battery charger, make sure to find one that is compatible with your country’s voltage (220V for Europe, 110V for North America, etc.).

How To Recharge CR2032 Batteries:

1) Using A Battery Charger

You will need to purchase a battery charger that is specifically designed to recharge CR2032 batteries. Make sure to follow the instructions that come with the charger.

Most chargers will have a light that turns green when the battery is done charging. Overcharging the battery may shorten its lifespan.

If you do not have a CR2032-specific charger, you can use a generic AA/AAA battery charger. However, you will need to be careful not to overcharge the battery as this could damage it.

To charge the battery using this method, connect the positive end of the AAA/AA charger to the positive end of the CR2032 battery and likewise for the negative ends.

  • To turn off the item, press and hold the “Power” button;
  • When the battery in your electronic device is no longer functioning, replace it with a new CR2032 battery. Follow the manufacturer’s instructions for replacing the battery from your specific product;
  • To charge a coin cell battery, insert it into a battery charger. If the instructions for the battery housing unit say to place the negative or positive terminal of the battery up, do so. To assure equal and proper charging, some multiple battery chargers require all slots to be filled;
  • Connect the charger. The batteries will immediately begin to charge once connected. Charge the battery until it is completely charged, as instructed by the manufacturer. Most battery chargers have a red and green light that tells you when your batteries are charging or are fully charged. When a battery charger has a red light, that means the batteries are still being charged; when there is no longer any green light on, it indicates that the batteries are fully charged;

2) Using A Power Adapter

This is a slower method to recharge your CR2032 batteries, but it will work in a pinch.

  • A power adapter that outputs DC voltage of between 200mA to 500mA and has a male USB Type-A connector;
  • An alligator clip test lead or some other way to connect the power adapter to the battery;
  • Connect the positive (red) lead of the alligator clip test lead to the positive end of the CR2032 battery;
  • Connect the negative (black) lead of the alligator clip test lead to the negative end of the USB cable;
  • Plug the USB cable into the power adapter;
  • Turn on the power adapter (if it has an ON/OFF switch);
  • Wait for the CR2032 battery to recharge (this could take a few hours);
  • Once the CR2032 battery is fully charged, disconnect the alligator clip test lead from the battery and then unplug the USB cable from the power adapter;


Are 2032 lithium batteries rechargeable?

The LiR2032 is a rechargeable lithium battery with a critical influence on the quality of life of the device. They also have a higher charging voltage, ranging from 3.2 to 3.9V [4].

Can button cell batteries be recharged?

Button cells may be divided into rechargeable and non-rechargeable varieties. The kind of battery is indicated by the English letters on a button-cell battery, while the number indicates the size. The diameter is represented by the first two digits, while the thickness is represented by the last two digits.

Typically, button cells are one-time-use (i.e., non-rechargeable, or galvanic battery). They are part of the dry battery family despite their distinct shape (AA, AAA, and AAAA).

Small Bluetooth headsets, for example, generally include rechargeable button cells (also known as secondary batteries) [5].

Are Energizer 2032 batteries rechargeable?

Up to 500 charge/discharge cycles are expected for each 2032 coin cell by Energizer, which can be charged up to 500 times before needing replacement.

How long does the CR2032 battery last?

Battery life is a phenomenon that depends on several variables, including material quality, storage conditions, storage duration, humidity, physical harm, and temperature. Ideally, you’d want a battery constructed of high-quality materials that have been stored in a cool and dry place with no visible damage [6].

When properly stored, Energizer states that their lithium coin cell batteries have a shelf life of up to 10 years. This will be determined by the application in terms of service life.

A CR2032 battery in a car key fob may survive up to 4-5 years before needing to be replaced since usage is quite infrequent.

How do you charge a coin battery?

To charge a coin battery, you will need a charging cradle and a power source. Place the coin battery into the charging cradle, and then plug the power source into the charging cradle. The charging process will begin automatically and will take approximately two hours to complete. Once the charging process is finished, unplug the power source from the charging cradle and remove the coin battery.

It is important to note that you should never attempt to recharge a CR2032 battery if it is not designed to be recharged. Doing so could damage the battery and cause it to leak or catch fire. If you have any questions about whether or not your CR2032 battery can be recharged, please contact the manufacturer for more information.

What is the longest-lasting CR2032 battery?

The Duracell 2032 3V Lithium Coin Battery is a CR 2032 battery that lasts 10 years in storage and is difficult to outdo.

This battery is recommended for use in watches, fitness devices, and glucose monitors.

The CR2032 batteries are also used in remote controls, keyless entry systems, and other small electronic devices [7].

How do you revive a dead button battery?

In many situations, coin lithium batteries are designed to be used only once. To put it another way, you merely use them once and then discard them. Secondary lithium-ion cells like rechargeable CR2032 technology have made it possible to create. These are batteries that can be recharged.

Why are button batteries not rechargeable?

The reason button batteries can’t be recharged is due to the battery’s chemistry. Button batteries are made with lithium, which is a highly reactive element. Lithium reacts with water to produce heat and hydrogen gas. This reaction is what powers the button battery.

However, this reaction also causes the lithium to slowly degrade over time. When the lithium degrades, it can no longer hold a charge and must be replaced. For this reason, button batteries are not rechargeable and must be disposed of properly when they are no longer working.

Are lithium coin cells rechargeable?

The answer is no, you can’t recharge lithium coin cells. Lithium-ion batteries, like the CR2032, are not designed to be recharged. If you attempt to recharge a lithium coin cell, it will likely cause permanent damage to the battery and could potentially be dangerous.

So if you find yourself with a dead CR2032 battery, your best bet is to simply replace it with a new one. While CR2032 batteries are relatively inexpensive, it’s still a good idea to conserve them as much as possible. One way to do this is by using a power-saving mode on devices that use them, such as LED lights.

Is 2032 the same as CR2032?

A 2032 battery is 20mm in diameter and 3.2mm thick.

  • CR2032 and BR2032 (the capitalization, or absence thereof, for the letters, does not matter);
  • CR2032 is the same as a CR2032 and BR2032 is the same as a BR2032;

What battery can replace CR2032?

If you need a CR2032 replacement, the Panasonic BR2032 is a good option. This battery has a higher capacity than the CR2032 (220 mAh vs 210 mAh) and can be used in any device that requires a CR2032 battery.

The Duracell DL2032 is another good option for replacing a CR2032 battery. This battery has a slightly lower capacity than the CR2032 (200 mAh vs 210 mAh) but it is more widely available and usually costs less than the Panasonic BR2032.

Are all CR2032 batteries lithium?

To put it another way, three types of 2032 batteries are all lithium batteries, since they are made up of various chemicals. This does not negate the fact that each lithium battery is equal. For example, you can interchange most CR2032 coin cell batteries with a BR2032 type lithium battery without causing any harm.

How can you tell if a CR2032 battery is good?

The simplest way to check if a CR2032 battery is good is to use a multimeter Set your multimeter to the “DC voltage” setting and touch the probes to the positive and negative terminals of the battery. If the reading is above 0.0 volts, then the battery is still good.

Another way to test a CR2032 battery is to use it in a device that uses CR2032 batteries. If the device powers on and seems to work normally, then the battery is probably still good.

Do lithium-ion batteries degrade if not used?

Lithium-ion batteries will degrade if left unused for long periods of time, even if they are not inserted into a device. This is because the electrolyte solution inside the battery begins to evaporate when it’s not being used, and this causes the battery’s internal structure to break down [9].

However, you don’t need to worry about this too much with CR2032 batteries, as they are typically used in devices that are regularly used (such as remotes and computer keyboards). If you have a CR2032 battery that’s been sitting around for a while, it should still work fine.

RAVPower CR123A 3V Lithium Battery

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Can I redeem multiple discount codes? No. Discount codes cannot be combined.Only one code can be applied per order.

Why is my discount code invalid? 1) The discount code is not applicable to the specific items you want to buy 2) The discount code wasn’t entered correctly 3) The discount code has expired 4) The discount code is not from Ravpower’s official website


NOTE: Batteries Can Not Be Recharged!

Long-Lasting Reliable PowerEach battery houses an impressive 1,500mAh capacity with low internal resistance. This ensures you can efficiently power your equipment for an extended period of time. Save the trouble of changing batteries for years to come.

Supports Most AppliancesInvest in a pack of RAVPower CR123A Batteries that can be used to power everyday appliances with the capacity of 1500mAh / 3.0V (4.5Wh). Pair it up with your Polaroid, Arlo cameras, flashlights, microphones, and most household medical equipment to be prepared for any emergencies. Replace CR123, DL123A, K123A, EL123AP, 5018LC, CR17345 and CR17335 with 3V voltage; Replace RCR123A, RCR17335, VL123A and ML123A with 3.7V voltage.

Superior Performance in Any WeatherBenefit from unconditional convenience and consistent performance in either freezing Arctic conditions or a scorching desert. Our batteries can beat the most extreme weather ranging from.40°C to 85°C /.49°F to 185°F.

Up to 10 Year Shelf LifePremium low self-discharge mechanism keeps for nearly 10 years of idleness without draining the battery. Never get stuck ever again because of a dead battery.

Greener and SaferEnvironment-friendly Li-ion batteries are your first step to a greener world. Containing no harmful chemicals, RAVPower batteries are guarded with short circuit, over current, and voltage surge Smart protections that are gentler to the earth and safer for you.

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