Battery BIOS: Everything You Need To Know About The 9V Battery. 9v battery bank

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Battery BIOS: Everything You Need To Know About The 9V Battery

The 9V battery is an extremely common battery that was first used in transistor radios. It features a rectangular prism shape that utilizes a pair of snap connectors which are located at the top of the battery. A wide array of both large and small battery manufacturers produce versions of the 9V battery. Possible chemistries of primary (non-rechargeable) 9V batteries include Alkaline, Carbon-Zinc (Heavy Duty), Lithium. Possible chemistries of secondary (rechargeable) 9V batteries include nickel-cadmium (NiCd ), nickel-metal hydride (NiMH ), and lithium ion. The performance and application of the battery can vary greatly between different chemistries, meaning that some chemistiries are better suited for some applications over others.

Technical Specifications Of The 9V Battery

9V Battery Nominal Voltage:

Capacity (Alkaline) ≈

Capacity (Carbon-Zinc) ≈

Capacity (Lithium Primary) ≈

Capacity (NiMH) ≈

Operating Temperature:

Alkaline, Lithium, Carbon-Zinc, NiCd, NiMH, Lithium-Ion

What Battery Is Equivalent To 9V?

The 9V battery was originally a part of the EverReady Power Pack (PP) line. The most common 9V battery in this line, is referred to as the PP3 battery. This is the typical 9V battery you would use today. The alkaline variant of the 9V battery is also referred to as 6LR61 and 006P. Other industry names for the 9V battery can be Duracell MN1604, Rayovac A1604, Energizer 522, Varta 4922, MX2400, 1604A, Radio Battery, Smoke Alarm Battery, 9V Block, and Krona.

How Long Does a 9V Battery Last?

The typical shelf life (storage in good condition) of an alkaline 9V battery will typically be about 10 years. The service life of a 9V battery can depend on a variety of factors. Most importantly it is determined by the chemistry/quality of the battery and the load you are putting it under. Applications that require a mild energy use, using a high quality battery can see battery life of up to 5 years. demanding applications and adverse environmental conditions like heat and moisture can result in a shortening of battery service life.

What Is The 9V Battery Used For?

The 9V battery is used in many different applications. 9 volt batteries can frequently be seen used in radios, smoke alarms, wall clocks, walkie-talkies, portable electronics, and much more. In the American prison system inmates have even been known to utilize the 9 volt battery to light cigarettes by adding a steel wool or wire to create an ultra hot contact point. This is not recommended as it can cause harm to you and your battery, but goes to show how many uses 9V batteries can have.

How to Dispose of 9V Batteries?

Where To Buy 9V Batteries?

9V batteries are extremely common and popular. This means that a wide variety of manufacturers make these batteries and a wide variety of retailers sell the battery. It is important to keep in mind that not all 9V batteries are created equal and that not all retailers have the same dedication to quality. To avoid low quality or worse, counterfeit batteries, it is important to only purchase your batteries from a highly reputable retailer that sells only the highest quality of brands. has been selling batteries online for over 25 Years and has one of the widest variety of batteries available, including all types of the 9V battery, from a variety of world-renowned manufacturers. For all your battery needs, please consider and let them be your battery expert!

About Us: is the leading provider when it comes to Hearing Aid Batteries, Watch Batteries, Lithium Coin Cells, Lithium Batteries, Alkaline Batteries, and Rechargeable Batteries across North South America. We have the capability to meet the needs of all sizes of consumers, dealers, distributors and importers. For over 25 years, we have been striving to ensure high customer satisfaction and providing the best quality product possible. Ever since our online store was launched 15 years ago, we have been constantly improving optimizing our site to provide the most enjoyable and convenient shopping experience for our valued customers.

Our online store has one of the largest selections of various batteries and battery products for all types of electronic applications on the web. Our website is very easy to navigate to help ensure customers can find exactly what they need. All of our products are conveniently organized by category. They can be easily filtered by the category drop down located at the top of every page on our website. Alternatively customers can use the Battery Finder™ located on our homepage, to quickly and simply identify the exact batteries they need. If you require any assistance in determining what products are right for you please do not hesitate to give us a call at (305)-371-9200.

At, you will find one of the largest selections of batteries on the web. We have millions of cells of common batteries like CR2025, CR2032, LR44, LR41, AA, and AAA in stock at all times. We also carry a wide variety of less common batteries such as CR2477, CR2016, Rechargeable Batteries, Radio Batteries, Telephone Batteries, and Pet Batteries. Regardless of your battery needs, we have got you covered. If you require a battery that we currently do not carry, please feel free to give us a call at (305)-371-9200 to place a special order (some restrictions apply).

Our customer base currently includes tens of thousands of satisfied consumers, various private companies, (local, state, federal, international) government agencies, military, institutions, wholesalers, and chain stores. Without hassle, we will ship your products worldwide, already having done so for over eighty-five countries.

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Guide to the Best Rechargeable 9V Batteries with Charger

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In the electronic modern world, 9 V batteries are everywhere. In fact, these are some of the most common batteries in the entire world, especially since they were originally introduced for the earliest transistor radios. Even if you don’t know the voltage, you can probably tell a 9 V battery apart from the others due to its iconic shape: all of them look like a rectangular prism and have a polarized snap connector at the top. Because of their early design and versatility, 9 V batteries are typically used in electronics that require consistent power, like smoke detectors or clocks.

While the original 9 V batteries were first made with mercury-oxide, they’ve evolved along with the battery manufacturing market and are now primarily made with nickel-metal hydride, nickel-cadmium, and lithium-ion. These newer materials have allowed 9 V batteries to remain relevant by preventing them from losing their ultimate charge capacity over time and helping them remain a consistent power choice for portable electronics across the world.

Rechargeable 9 V batteries are actually quite common, and they’re a great choice for the devices we mentioned above and others. As a result, 9 V battery chargers have also become more common over time, especially as people have become more environmentally aware. While it was once much more common for people to buy packs of 9 V batteries and toss them when they were done, the damage this does the environment has caused many to start looking into more renewable or longer-lasting batteries.

This leads to 9 V battery chargers. Chargers can come in a variety of shapes, sizes, and types, with the only real commonality between them being that they provide power to rectangular prism 9 V batteries. Due to all this variety, we wanted to find the best rechargeable 9 V batteries with a charger in the purchase. Grabbing both the batteries themselves and the charger in the same instant is great for convenience and ease of use. We’ll look at three excellent 9 V battery packs that include chargers for them to see which is best overall or if they’re each better for unique circumstances.

EBL 9v 5-Pack Batteries with Charger

This package comes with five 9 V batteries, and a charging station specifically designed to support this number, although you don’t need to have all five plugged in to get some charging done. The manufacturer, EBL, has been designing batteries and their charters for more than 20 years and has perfected their techniques. As a result, these batteries are an excellent choice for smoke detectors, toys, clocks, and even medical devices due to their reliability and consistency.

These batteries are nickel-metal hydride, or NiMH. These aren’t quite as energy-dense as lithium-ion batteries, but they have a great capacity compared to cheaper batteries you can buy at most stores.

The batteries have an excellent low self-discharge function. This essentially means that they don’t easily lose battery life or capacity even if they aren’t regularly filled up and drained. In fact, they can retain up to 75% of their capacity after three years of nonuse. That’s a huge deal compared to other 9 V batteries on the market.

The batteries also come pre-charged right out of the box, so you don’t need to spend time charging them if you require their power right away.

Charger Form and Function

The included charger with this kit is another high-quality piece of equipment. As we stated, it has special slots for all five of the included batteries, as well as a storage case in which you can keep the charger and any extra batteries you’re not currently using for organization purposes.

The charger is safe and reliable, using technical MCU controls to charge the batteries quickly and consistently without compromising battery integrity or getting too hot. That’s a big plus side in our eyes, as many cheaper battery chargers make their batteries too hot for comfort as they reach peak charging rate.

The case comes with the cable you need to begin charging immediately, as well as a wall plug. You can just as easily plug this into a computer or tablet and charge the batteries that way, too.

You’ll also be able to use the charger in a variety of places because the USB cable can be used with a standard wall outlet (which does come with the purchase), a USB-port device, a car charger, or even a power bank. Using it with a car charger obviously lets you recharge your batteries on the go, while the power bank can be pre-charged anywhere you have a standard outlet. You can then take this power bank wherever you need and recharge the batteries included in this kit thanks to the stored power of the bank. We think this is a great feature in case you ever want to take this kit camping or anywhere else a power outlet isn’t easily found.

Delipow 9V Rechargeable Battery Pack with Micro USB Charging Port

This battery/charger combo is another excellent pick, and it’s a little more affordable than the EBL charger. It comes with a two-pack of 9 V rechargeable lithium-ion batteries. Lithium-ion batteries are an excellent choice for most rechargeable power needs and are most often used for portable electronics. They, along with the two-pack contained in this kit, provide high-density energy and excellent power efficiency. They usually have a low self-discharge rate of about 2% per month.

The Delipow 9 V lithium-ion batteries are ideal for lots of portable electronics like walkie-talkies, microphones, toys, flashlights, musical instruments, and medical devices. They have an excellent low self-discharge rate that guarantees that they’ll still have 75% of their capacity after three years, just like the EBL batteries. Because they last a long, they’re a great choice if you want to reduce your carbon footprint and be environmentally conscious.

Each of the batteries has a few unique features that make them stand above the rest on the market. For starters, they feature short circuit protection and overheat protection combined. Basically, these safeguards will prevent the batteries from overheating or short-circuiting if they’re placed into a high-voltage device.

They also have over-charge protection to defend their integrity and capacity if you leave them to charge for too long. To make things even better, the batteries come with a 30-day free refund deal and a one-year free replacement lifetime warranty as soon as you purchase this kit. It’s phenomenal in terms of value for money, and we think it’s a great choice for those who need 9 V batteries and a charger on a budget.

Charger Form and Function

These batteries circumvent the need for a dedicated charging port, instead relying on a micro USB cable that plugs right into the batteries themselves and into a wall outlet. Because of the micro USB cable, you can also charge these individual batteries anywhere you can fit the USB end; devices like laptops or tablets work just as well, as do car chargers that have USB functionality.

It’s excellent if you want a mobile battery charging solution that doesn’t require you to pack up a bulky charging station every time you need to go. The downside is that you can only use this charging cable with 9V lithium-ion batteries just like these, which have dedicated ports for micro USB connectivity. This charging scheme is specific to these Delipow batteries, rather than a general solution that’ll work for all 9 V power needs.

The batteries do come with a storage kit for the batteries themselves and the charger. This is nice, as the micro USB cable is pretty short and liable to get lost if you don’t have a dedicated spot for it in mind.

Tenergy 9V Rechargeable Battery with 2 Bay 9V Charger

The Tenergy batteries are nickel-metal hydride as well. This kit comes with 49 V batteries, each of which is ideal for a variety of uses like smoke alarms, walkie-talkies, and any hydrant medical device. The dimensions are about 48 mm x 26 mm x 16 mm. They’ll recharge up to 1000 times, in part because of their very high capacity. This limits the damage caused by overcharging or letting them sit for too long.

These batteries can be charged from several charger models from the same manufacturer, which has been producing batteries and electronic gear for many years. They also only take an hour or two to fully charge from empty, making them a great choice if you like batteries you can get placed back into your devices in no time at all.

Charger Form and Function

The charger of this kit is the main attraction. It’s incredibly compact and plugs right into any typical wall outlet rated for 100 V to 240 V AC. It’s perfect for use throughout the entire world without needing a converter, although you might need a plug adapter based on outlet shape. This high-performance charger can even be folded so you can store in a variety of places or allow it to charge your batteries in peace while being discreet, even if you place it in a main living area.

This charger has lots of Smart functions that demonstrate its advanced design. We thought that the built-in safety timer was an excellent bonus. This automatically kicks in after five hours and shuts the charger off to prevent it from overcharging the batteries and potentially causing a fire hazard. It’s a great feature, particularly for busy households or for parents who have a lot to think about at any given moment.

We also really like the microprocessor control unit integrated into the charger design. This microprocessor checks the polarity and charge status of every battery plugged into the charger itself to monitor for potential problems. It’s built with two independent charging channels, each of which has an independent LED light. This light winks on when a particular battery is currently charging or if it’s all done. We really like this aspect since it means you won’t have to guess about whether your battery is fully charged or just partly.

All in all, it’s just a phenomenal piece of tech that does a great job of safely charging included batteries and any 9 V cells that fit into the ports. It never goes above 40°C, either, so you shouldn’t easily burn your hand on its surface even after quickly charging both batteries at once. The only downside is that the kit comes with four batteries in the purchase, but it only has room to charge two at a time. Still, this minor issue isn’t enough to overcome all the huge positives.

Final Verdict

Overall, each of these 9 V battery packs with their chargers are great choices. However, we have to say that the Delipow 9V Rechargeable Battery Pack with Micro USB Charging Port will probably be the best choice for most for a few reasons. For starters, the batteries themselves are lithium-ion, while the other two choices are nickel-metal hydride. This means that the batteries last a little longer than their competitors and their capacity will diminish at a slightly slower rate.

In addition, their charger is the simplest and easiest to use. It’s literally just a USB cable that plugs into the rechargeable batteries themselves, but you can’t fault the manufacturer for sticking with what works. The charger cable can be taken just about anywhere, and it works so long as you have a USB port with which you can draw power. It certainly takes up way less space than the EBL charger.

However, both of the other options are great if you want to charge multiple batteries at the same time. The Delipow pack only lets you charge a single battery at once, which can be inconvenient if you need multiple to power a device. So go with the first or third options if you want the ability to charge multiple 9 V batteries simultaneously.

USB Rechargeable 9V Battery Kit

Never Buy Traditional 9V Batteries Again. Always have power on hand for your critical devices with your 4Patriots USB-Rechargeable 9V Battery Kits. These rechargeable batteries work anywhere you’d use “regular” 9V Batteries. And they pay for themselves hundreds of times over.

  • Rechargeable up to 500 times
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  • Kit includes 2 9V batteries, 1 clamshell case, and 1 micro-USB charging cord
  • Ships from Utah, USA
  • FREE digital blackout report
  • FREE Shipping for orders of 97 (USA 48)

USB-Rechargeable 9V Battery Kit

Never Buy Traditional 9V Batteries Again!

Your USB-Rechargeable 9V Battery Kit is in it for the long haul. Drain them down and charge them again… up to 500 times! And you can use your USB-Rechargeable Battery Kits to power multiple devices like.

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Battery performance varies based on charging and usage conditions. For more information, see footnote 2.

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Real reviews from real customers. Sometimes customers receive a free product to test or receive a free product as a thank you for submitting honest feedback. For more information, see footnote 1.

Real reviews from real customers. Sometimes customers receive a free product to test or receive a free product as a thank you for submitting honest feedback. For more information, see footnote 1.

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You can use your USB-Rechargeable D Battery Pack to power multiple devices. So be sure to keep these handy batteries in cars, at home, at the cabin, or in your RV. Anywhere you might need an extra oomph of portable backup power like.

  • At home
  • Power outages
  • In emergencies
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And much more! These batteries could truly make a difference for you and your family in a crisis. Click “Add to Cart” to start your order now.

24 Hours a Day / 7 Days a Week / 365 Days a Year

Battery performance varies based on charging and usage conditions. For more information, see footnote 2.

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“Fast Recharge” with Any USB

Your batteries can be charged using the included micro USB cord. So you can recharge these batteries anywhere, anytime with just a USB outlet.

Battery charge times vary based on individual battery capacity. For more information, see footnote 2.

500x the Power of a Traditional Battery!

These rechargeable battery collections will pay for themselves thousands of times over. You’ll save a ton of money. because you can drain them down and recharge them… 500 times!

Your Best Choice for Value Convenience

Truth be told, your USB-Rechargeable 9V Battery Kits can save you a mountain of money, time and boxes full of wasted and hazardous single-use batteries.

Charge these batteries anywhere, anytime. The enclosed micro USB cord lets you charge up to 4 batteries at once! No fancy equipment required. Just plug them in, forget about them, and they’re recharged when you come back!

USB-Rechargeable 9V Battery Kits Information:

Compatible Devices

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I Bought 4 Kits to Charge EVERYTHING

I bought 4 four-packs of USB batteries and I am so glad I found these. After charging all the batteries I’m using them everywhere. Flashlights, PC mouse, led lighting, blood pressure cuff.

The four-battery charger port that comes with each pack is a neat nesting device that can not only charge the batteries but also other USB devices.

This product will pay for itself very quickly. Did I mention that I can charge my drone too and use the batteries in the wireless controller too.

I Feel Secure Having This

These batteries can be a lifesaver when something unexpected happens. Especially along with the 4Patriots solar-powered charger. They can all work hand-in-hand together.

Grab as many of these as you can get. You never know when you’ll need them, but you’ll be thankful you have them when that time comes!

Real reviews from real customers. Sometimes customers receive a free product to test or receive a free product as a thank you for submitting honest feedback. For more information, see footnote 1.

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Frequently Asked Questions

Q: What if I change my mind?

Q: Is it safe to buy online?

All testimonials in this advertisement are from real people; sometimes names and photos have been changed to protect their privacy and some were given free products in exchange for their honest feedback. Testimonials represent exceptional results, don’t apply to the average purchaser and are not intended to guarantee that anyone will achieve the same results. The organizations, publications and people referenced on this site are not affiliated with 4Patriots. They have not endorsed, sponsored or recommended this product; no affiliation or endorsement is claimed. Terms conditions apply. Cade Courtley is a former Navy SEAL and Platoon Commander who served 9 years of active duty and has been compensated by 4Patriots for his hard work in helping us test and endorse this product.

Battery charge times will vary based on the power capacity (mAh) of the battery. Always follow proper charging and usage instructions. Approximate charge times per battery type are as follows… D-batteries: 1.5 hours.

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What’s The Difference Between Wiring Batteries in Series Vs. Parallel?

Understanding the difference between wiring batteries in series vs. parallel is critical if you have a multiple battery system. How you connect your batteries will determine how they perform in different applications. Let’s look closer at how to wire batteries in series vs. parallel and when each method is appropriate.

What’s The Difference Between Wiring Batteries in Series Vs. Parallel?

The main difference in wiring batteries in series vs. parallel is the impact on the output voltage and the capacity of the battery system. Batteries wired in series will have their voltages added together. Batteries wired in parallel will have their capacities (measured in amp-hours) added together. However, the total available energy (measured in watt-hours) in both configurations is the same.

For example, wiring two 12-volt batteries with 100 Ah capacities in series will output 24 volts with a 100 Ah capacity. Wiring the same two batteries in parallel will output 12 volts with a 200 Ah capacity. Thus, both systems have a total available energy of 2400 watt-hours (watt-hours = volts x amp-hours).

Additionally, batteries wired in series and parallel configurations should all have the same voltage and capacity rating. Mixing and matching voltages and capacities can lead to problems that may damage your batteries.

Wiring Batteries in Series

To wire multiple batteries in series, connect the positive terminal of each battery to the negative terminal of the next. Then, measure the system’s total output voltage between the negative terminal of the first battery and the positive terminal of the last battery in series. Let’s look at two examples to make this clear.

The first example is two 100 Ah batteries wired in series. As you can see, the positive terminal on the first battery is connected to the negative terminal on the second. Thus, the total system voltage is 24 volts, and the total capacity is 100 Ah.

The second example is wired the same way but with a third battery. The voltages of all three batteries add together, resulting in a system voltage of 36 volts, but the capacity remains at 100 Ah.


The power a device consumes is equal to its operating voltage multiplied by the current it draws. For example, a 360-watt device operating at 12 volts would draw 30 amps (12 x 30 = 360). That same device operating at 24 volts would only draw 15 amps (24 x 15 = 360).

Wiring batteries in series provides a higher system voltage which results in a lower system current. Less current means you can use thinner wiring and will suffer less voltage drop in the system.

In addition to power draw, charging works the same way. Consider an MPPT solar charge controller rated at 50amps. a 50A x 12V controller could only handle 600 watts of solar, but at 24Vx50A it could handle 1200 watts!

In general, operating larger power systems can see big benefits in running batteries in series at higher voltages.


In a battery system wired in series, you cannot get lower voltages off the battery bank without using a converter. Either all equipment needs to function at the higher voltage or an additional converter is needed to use 12V appliances on the system.

Wiring Batteries in Parallel

To wire multiple batteries in parallel, you connect all of the positive terminals together and all of the negative terminals together. Since all of the positive and negative terminals are connected, you can measure the system output voltage across any two positive and negative battery terminals. Let’s look at two examples to make this clear.

The first example is two 100 Ah batteries wired in parallel. The positive terminal on the first battery is connected to the positive terminal on the second. Likewise, the negative terminals of both batteries are also connected. The total system voltage is 12 volts, and the total capacity is 200 Ah.

The second example is wired the same way but with a third battery. The capacities of all three batteries add together, resulting in a total capacity of 300 Ah at 12 volts.


The main advantage of wiring batteries in parallel is that you increase the available runtime of your system while maintaining the voltage. Since the amp-hour capacities are additive, two batteries in parallel double your runtime, three batteries triple it, and so on.

Another advantage to wiring batteries in parallel is that if one of your batteries dies or has an issue, the remaining batteries in the system can still provide power.


The main drawback to wiring batteries in parallel vs. series is that the system voltage will be lower, resulting in a higher current draw. Higher current means thicker cables and more voltage drop. Larger power appliances and generation are harder to operate and less efficient when operating at lower voltages.

How Many Batteries Can You Wire In Series?

The limit on how many batteries you can wire in series typically depends on the battery and manufacturer. For example, Battle Born allows up to four of their lithium batteries to be wired in series to create a 48-volt system. Always check with your battery manufacturer to ensure you do not exceed their recommended limit of batteries in series.

How Many Batteries Can You Wire In Parallel?

There is no limit to how many batteries you can wire in parallel. The more batteries you add in a parallel circuit, the more capacity and longer runtime you will have available. Keep in mind that the more batteries you have in parallel, the longer it will take to charge the system.

With very large parallel battery banks comes much higher current availability as well. This means the proper system fusing is critical to prevent accidental shorts that could have catastrophic consequences with so much current available.

Can You Wire Batteries in Series and Parallel?

You cannot wire the same batteries in series and parallel as you would short the system, but you can wire sets of batteries in series and parallel to create a larger battery bank at a higher voltage.

The photo below wires two batteries in series to get 24V then that set is wired in parallel to another set of 24V batteries. Think of each set of series batteries as one battery. You must “create” another set of batteries equal to the voltage of the first to wire them in parallel.

Here is another graphic of our heated lithium batteries wired in a series-parallel configuration. This setup would yield a 24V 200AH bank. While the amp hour is smaller, the power is the same because of the higher voltage.

Charging Batteries in Series Vs. Parallel

Besides making sure you have the correct voltage charger, batteries in series vs. parallel charge the same way. For batteries wired in series, connect the positive charger cable to the positive terminal on the first battery in series and the negative charger cable to the negative terminal on the last battery in the series. For even charge across a parallel bank, connect your charge in the same fashion: positive connect to first battery, and negative connected to last battery.

Optionally, a multi-bank battery charger may provide faster charge times for series and parallel battery banks. As always, refer to the manufacturer’s recommendation for the best way to charge your batteries.

➡ Also be sure to read our article on Charging Lithium Batteries: The Basics.

FAQ: Do Batteries Last Longer In Series Or Parallel?

Series connections provide a higher voltage which is slightly more efficient. This means that batteries wired in series can last marginally longer than batteries wired in parallel. However, batteries connected in series vs. parallel will provide roughly the same amount of runtime. Let’s take a look at a quick example that explains why this is true.

Two 12-volt batteries with a 100 Ah capacity are powering a 240-watt device. These two batteries wired in series will provide 24 volts and 100 Ah of capacity. The current draw of the device will be ten amps (24 x 10 = 240). The theoretical runtime of the series system is 100 Ah divided by ten amps, which is ten hours.

Conversely, the same two batteries in parallel provide 12-volts and 200 Ah of capacity. The device’s current draw in this setup is 20 amps (12 x 20 = 240). The theoretical runtime of the parallel system is 200 Ah divided by 20 amps, which is also ten hours.

Batteries in Series Vs. Parallel: Which Is For You?

Deciding between connecting your batteries in series vs. parallel is often dictated by the needs of the devices you’re powering. For general boat and RV applications wiring batteries in parallel provides the simplest wiring and common voltage, however, for large applications beyond 3000 watts of power, using higher voltage series connections might be best. Now that you understand how each wiring configuration works, you can determine the best option for your needs and proceed with confidence.

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