8 Battery Hacks That Will Save You Thousands. 4 d batteries voltage

D Cell Battery Voltage- Introduction, Volts And Replacement

Although a lot of new batteries are being developed in the market, some are rechargeable while others are not. One thing that is not chanced is the application of some of the old batteries like the D cell batteries. This is a type of battery that people have been using for years.

Although they are used for a wide range of heavy-duty applications, some people do not know a lot about these batteries. Here we will discuss the D cell batteries and the ways to use them.

What is a D cell battery?

If you are familiar with the old school flashlights that made yellow light, you might be aware that these flashlights used a very thick and large cell. This cell that was used in these lights and some other things too is known as the D cell battery. Here we will discuss some distinct specifications of the D cell battery.

What is the shape of a D cell battery?

The D cell battery belongs to the family of the AA cell batteries. This is the reason why this battery has a similar shape and form factor. The only difference in these batteries is their size. If we compare the size of these batteries for some of the famous batteries of this family, we can list them as follows.

These battles are listed from the smallest size on the top to the largest on the bottom. However, the shape of all of these batteries is cylindrical.

How to identify the D cell battery?

If you are looking for the D cell battery, it is very important that you correctly identify this battery. It is because due to the large size, most of the time people get confused between the D cell and the C cell batteries.

The first thing that you can do is to check the label of this battery for a D written anywhere. Other than this, you can also look for the size of the D cell batteries that are mentioned below.

?The diameter of the D cell batteries is 1.3 inches.

?The length of the D cell batteries is 2.42 inches.

How many volts is the D cell battery?

As the size of the D cell battery is fairly large than the other batteries of this family, most of the people have this misconception that these batteries will provide more voltage. This is a wrong concept because these batteries are not able to provide any more voltage than 1.5 volts.

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However, as these batteries are labeled as heavy-duty batteries, they can provide power for a longer time.

What is the difference between the voltage of a rechargeable and non-rechargeable D cell battery?

An amazing thing is that these D cell batteries are available in both the rechargeable and non-rechargeable variants. However, the rechargeable batteries can last longer than the regular batteries, their voltage is a little lesser. If we compare the voltage of regular batteries to the rechargeable batteries, we will be able to see a difference of about 0.3-volts.

It is because the regular batteries can put out 1.5-volts however the rechargeable D cell batteries can put out only 1.2-volts maximum.

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What is the life of a D cell battery?

This is a very important thing to know because most of the people have misconceptions about the voltage of these batteries. However, these batteries can last longer than the other batteries that provide the same voltage.

If we take the common AA batteries and the D cell batteries and both of them have the same capacity, The D cell batteries will easily last about 4 times longer than the regular AA batteries.

How do you replace a D cell battery?

Although these batteries have a very long-life span as compared to the smaller batteries with the same voltage, they still need to be replaced. Their long-life span makes people confused about replacing these batteries.

So, here we will provide our step by step guide on how to replace the D cell batteries. So that you can replace the D cell batteries by yourself without any major issues.

1.Take the old battery out.

The first thing that you will need to do is to take the old battery out. If the battery shows no leakage, you can remove it with your bare hands. However, if you see signs of corrosion or leakage, it is preferred to use a tool or use gloves to remove that battery.

2.Either remember the configuration of the old battery or look for indications.

While you are taking out the battery, it will be a good practice that you note the orientation of the battery because it will help put the new battery in.

3.Identify the terminals of the replacement battery.

Now that you have the battery removed, it is time to insert the battery. However, the first thing that you will need to do is that you check the terminals of the new battery. You can easily identify the terminals of the new battery by searching for the “” and “-” signs on the label of the battery.

If the signs are not present there for any reason, you can feel the terminals of the battery. The flat terminal will be the negative one.

4.Put the battery in the correct orientation.

When you are ready to put the new battery in, make sure that there are no corrosion marks on the terminals of the device. If there is corrosion, make sure that you clean it with some brush or alcohol and cloth. After a thorough cleaning, you can insert the battery aligning the positive terminal with the positive terminal and likewise for the negative terminal.

It is very important to have all the information about the things you use and the things you need. That is why here we shared some everything about the D cell batteries so you will be aware of all the factors about them in the hour of need.

Battery Hacks That Will Save You Thousands

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I hope you had a relaxing holiday break. I know that our house has been invaded by all sorts of buzzing, flashing, and really noisy toys. And you know what all those toys have in common? Batteries.

Did you know that most devices will stop working whenever the juice in its batteries fall by just 20%?

I’m not sure I believe it but…

… I learned about a little startup that had a product called Batteriser. They make a sleeve that goes around a battery and helps you get the remaining 80%. It’s “still in development” and I’m eager to see their progress but like a lot of folks I’m skeptical (very skeptical).

(I’m very skeptical too… you know what they say about things that are too good to be true…)

Reading about it, and constantly tripping over a million flashing, singing, and rolling toys; sparked my interest in batteries.

What does a blogger do? I compiled a list of battery hacks I use to help me save money, lengthen the lifespan of our batteries, and work around incompatible battery sizes (because who wants to go to the store in the middle of the night to pick up the right battery?).

Before the hacks, we need to go through a quick lesson in batteries. Knowing how batteries work is like having a cheat code, all the hacks will make sense and you’ll be able to remember them better.

How electricity batteries work in 60 seconds

This part contains a wee bit of science and it will turn you into a MacGyver when it comes to batteries.

First, electricity is the flow of electrons through a conductor, like a copper wire.

A battery has a cathode and an anode (-) separated by an electrolyte. The chemical reaction in the battery causes a build up of electrons at the anode. These electrons really want to go to the cathode to balance it out but the electrolyte stops them. They go along whatever path you supply that connects the anode and cathode, like when you put the battery in a toy. Over time, anode and cathode under go chemical change and supply no more electrons.

For alkaline batteries, this chemical change creates a little bit of hydrogen gas. That gas needs to go somewhere, which is why batteries sometimes leak. After a certain time, the pressure builds and the gas needs to escape. Batteries leak because they are being drained (phantom drain) and age. A quick takeaway here is that if you are putting anything in storage, take out the batteries.

OK, now you know about batteries. Let’s get back to electricity. It’s all about voltage and amperage (current).

If electricity were like water flowing through a hose, the amperage is the diameter of the hose. Voltage is like water pressure on the one end, or how much you’ve opened the faucet.

AAA, AA, C, and D batteries are all 1.5 volts. All the same voltage.

They differ on amperage. As a result, they contain different Watt-hours (Watts is voltage time amperage) – or total amount of energy. That explains why they’re different sizes too.

For the curious, this is a table listing all types and how much energy they contain.

Armed with this knowledge, the hacks below will make perfect sense.

Not all batteries discharge equally!

It might surprise you to learn that when your device is “out of juice,” it doesn’t mean every battery is completely consumed. Test each one to find out which one is the low man on the totem pole, then just replace him.

You’ll need a battery tester. You can get one designed to test batteries (it’s only 7) or get a multimeter (costs about 10 more) which will let you test a variety of things (current, voltage, resistance, etc.) across two points.

In most devices, you put the batteries in series to increase the voltage. It’s why you point batteries in different directions. (this is also why a 9V battery can be just 6 AAAs, which have 1.5 V each)

When your device stops working, you may only need to replace one battery. I discovered this happens a lot with children’s toys.

Replacing one battery is cheaper and easier than replacing them all. And you might have a spare lying around but not a whole set.

You can test non-rechargeable batteries without a tester — Hold them about two inches above a hard surface and drop them. A dead battery will bounce higher than a good one. Much higher. (this won’t work for rechargeable batteries)

Every battery works on the same principle, you complete a circuit and something inside the battery oxidizes. That process makes the battery bouncier. It’s not perfect but it’s better than throwing them all out.

In an alkaline battery, the negative electrode is zinc and the positive electrode is manganese dioxide. It all sits in an alkaline electrolyte of potassium hydroxide, hence the name of the battery. When you complete the circuit, the zinc and manganese dioxide react to create electricity and waste byproducts. That process makes the battery bouncier because of how it changes the consistency of the inside of the battery.

Batteries are (Kinda) Interchangeable

Want to know how Cs become Ds, AAAs become AAs?

Now that we know how many batteries we need to replace, we can start MacGyvering. Since we learned how batteries worked in the beginning, we know it just comes down to size.

How to Turn C Batteries into D Batteries

If you’re in a jam and you have a device that takes D batteries and you only have C batteries, you can jury rig the C batteries in the D’s place just by sticking in three quarters.

Put in the C battery and jam three quarters, which conduct electricity, on the negative or positive end, whichever is easiest. C batteries have less than half the energy capacity and discharge of D batteries but will work. Just not as long.

Bonus: AAA can take the place of AAs with a little crumpled up tin foil to complete the connection.

Turn a 9Vs into 6 AAAs

Cut it open and you’ll find six AAAs inside.

Here’s a video, if you are so brave:

Turn a 12Vs into 8 1.5V button cell batteries

I think you’re starting to understand how this works.

Find a A23 12V battery, cut it open, and you’ll find 8 1.5V button batteries inside. This one can save you a lot of money too because an A23 12V battery will run you about 1.00-1.50 for a pair. A single 1.5V button battery will run you about 1.50 too. Buy two A23 12V batteries for 1.50 and rip them open to liberate 24 worth of batteries inside.

Get Juice by “Rubbing” Battery Contacts

What happens when you rub on the contacts of a battery? You’re not “recharging” the battery a little bit, you’re just cleaning off the connection points and improving conductivity.

Remember the battery is a chemical reaction and you aren’t reversing it when you rub a contact. You are just taking off any conduction impeding gunk, so the juice can flow more easily. This might get you one last press, or two, of the remote to turn off your TV. It won’t give you another hour of shine in your flashlight.

Recharge alkaline batteries with other alkaline batteries

Apparently, you can recharge an alkaline battery using other alkaline batteries. Just tape them and wait a long time.

Infinite solutions! (I actually have no idea if this works but this guy feels confident it does and I love everything about that video)

Remove Batteries before Storage

Before you put any items in storage, where you won’t use or see them for a while, remove the batteries. Alkaline batteries will eventually leak and damage your devices, especially if left alone for many months.

We have a seemingly unlimited supply of kids toys and as they age out and lose interest, we put them away… without batteries.

Oh, don’t freeze your batteries!

I know a lot of people who store batteries in the fridge or freezer because they believe it prolongs life.

Is it a good idea to store batteries in a refrigerator or freezer?No, storage in a refrigerator or freezer is not required or recommended for batteries produced today. Cold temperature storage can in fact harm batteries if condensation results in corroded contacts or label or seal damage due to extreme temperature storage. To maximize performance and shelf life, store batteries at normal room temperatures (68°F to 78°F or 20°C to 25°C) with moderated humidity levels (35 to 65% RH).

So why do people do it? Alkaline batteries self-discharge at room temperature (70° F) at a rate of 2% per year. Storing them at lower than room temperature will help, but it’s only 2% per year and you run the risk of you forgetting you stored them next to the bag of salad you also forgot about.

NiMH and NiCd batteries (rechargeable) discharge much faster (some say a few percents a day) so there’s some logic in storing those in the fridge, but here’s why you shouldn’t. Extreme cold can cause the seals on the battery to leak. The moisture in the fridge isn’t great for the metal parts of the battery either. Finally, you should bring the battery up to room temperature before using. You might as well just charge the batteries before you need them.

Armed with this newfound power, go forth and conquer the world!

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About Jim Wang

Jim Wang is a forty-something father of four who is a frequent contributor to Forbes and Vanguard’s Blog. He has also been fortunate to have appeared in the New York Times, Baltimore Sun, Entrepreneur, and Marketplace Money.

Jim has a B.S. in Computer Science and Economics from Carnegie Mellon University, an M.S. in Information Technology. Software Engineering from Carnegie Mellon University, as well as a Masters in Business Administration from Johns Hopkins University. His approach to personal finance is that of an engineer, breaking down complex subjects into bite-sized easily understood concepts that you can use in your daily life.

One of his favorite tools (here’s my treasure chest of tools,, everything I use) is Personal Capital, which enables him to manage his finances in just 15-minutes each month. They also offer financial planning, such as a Retirement Planning Tool that can tell you if you’re on track to retire when you want. It’s free.

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He is also diversifying his investment portfolio by adding a little bit of real estate. But not rental homes, because he doesn’t want a second job, it’s diversified small investments in a few commercial properties and farms in Illinois, Louisiana, and California through AcreTrader.

Recently, he’s invested in a few pieces of art on Masterworks too.

Opinions expressed here are the author’s alone, not those of any bank or financial institution. This content has not been reviewed, approved or otherwise endorsed by any of these entities.

Reader Interactions

Комментарии и мнения владельцев

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These responses are not provided or commissioned by the bank advertiser. Responses have not been reviewed, approved or otherwise endorsed by the bank advertiser. It is not the bank advertiser’s responsibility to ensure all posts and/or questions are answered.

Wow Jim, These are awesome. I had no idea there were tiny batteries inside a 9V. Also, great hack on making a C battery a D battery when you’re in a jam!

  • Jim says January 4, 2016 at 9:47 am

That sure surprised me. Last time I tore a 9V apart, it was full of six flat cells filling out the entire innards. But that was nearly 50 years ago. Once upon a time I recall seeing commercially available small to large battery adapters too.

  • Jim says January 13, 2016 at 6:06 am
battery, hacks, thousands, batteries, voltage

Each manufacturer may use a different configuration. Not all 9V batteries have cylindrical cells inside. Also, 6 AAA batteries will not fit in a 9V battery housing. The cylindrical cells in some 9V batteries are AAAA size. (set 6 AAA batteries next to a 9V and it will be clear)

I remember ALWAYS needing batteries as a kid. As an adult, I can’t remember the last time I needed a battery (beyond the rechargables for the phone and computer of course )

  • Jim says January 4, 2016 at 10:34 am

The surprise for me was the tiny screwdriver that was required for changing the batteries in everything. Changing batteries becomes an event with kids.

  • Jim says January 4, 2016 at 2:59 pm

I didn’t know we had the option of replacing one battery in a gadget because I’ve always heard people say you shouldn’t mix new batteries with old ones. My parents used to recharge all batteries at home and it’s a pity I don’t do the same as a grown up because it can save lots of money in the long run. One other tip here – some batteries have a small ‘charge meter’ that indicates how much power is remaining. I don’t remember which brand or type they are (maybe the rechargeable ones) but its a pretty useful feature.

  • Jim says January 4, 2016 at 2:59 pm

I’d always heard you shouldn’t mix brands and you shouldn’t mix different types of batteries, though we’ve often mixed brands. We’ve definitely replaced just one though.

This is true and goes along with “Recharge alkaline batteries with other alkaline batteries”. It is not a good idea. When the batteries are not at the same state of charge, the fuller battery tries to charge the weaker one, which produces a gas from the reaction. This is what causes the corrosion when stored in devices for a long time. People say the batteries leaked, but that isn’t actually the case.

This is perfect timing. My daughter got a camera that needs batteries for Christmas and she has been churning through them. Will give these tips a go. Thank you!

  • Jim says January 5, 2016 at 11:12 am

Interesting! I never knew these things about batteries. Batteries are something I’ve gotten as a stocking stuffer for Christmas in the past. You can never have too many batteries around these days since lots of things need them.

  • Jim says January 6, 2016 at 8:12 pm

Years ago, Duracell used to give out free ‘battery testers’ as part of the packaging. Fortunately, I saved one of each type at the time. I really enjoyed the battery hacks. I even tweeted a link to your battery post. One thing that happened to me was I discovered (when my electricity went out) that all the D batteries in my 5 battery flashlight had died. Fortunately, I had a new pack of four batteries (not 5, darn). However, I put in the four new ones and one of the ‘dead’ ones, and the flashlight worked fine, almost as bright as normal.

  • Jim says January 6, 2016 at 8:13 pm

Thanks Fred! Yeah I remember they had these strips you could use to touch positive to negative. I have one of those cheap battery testers now and it works great. The wire inside broke once so I had to solder it but it’s so simple it was an easy fix. Nice little jury rig on the flashlight! It’s the whole “not all batteries are discharged equally” at play for sure… saved yourself a trip (in the dark!).

This by far is the most interesting post I’ve read about batteries this week! Great info about not having to replace all the batteries! I do that way too often! Does the brand of the battery matter? I’m assuming no, unless it’s from the Dollar Tree – those will probably explode in your remote when you’re using it. haha.

  • Jim says January 8, 2016 at 6:46 am

Hahahahah what about last week? If you stick with one brand for a device, you’ll be fine. If you mean if the Dollar Tree brand is as durable as a name brand? That I don’t know but my guess is it isn’t. First, who knows how long it’s been on a shelf before it goes to clearance places like dollar stores. Next, you don’t know if it’s made of quality materials so it might leak faster? I’d worry more about age though. When you buy a new TV, the batteries they give you are no-name brands so they don’t seem to care.

Remember to tape the terminals on your batteries before recycling or tossing them and always store them in their cardboard boxes. Several houses have burned from loose 9v batteries in the junk drawer.

  • Jim says January 13, 2016 at 5:50 am

Really? Burned because of loose 9v batteries? My crack research staff (I googled it) uncovered this story on Snopes – http://www.snopes.com/horrors/techno/9voltfires.asp – “partly true”… which is more true than I expected!

Touch a 9v battery to steel wool and you can see the potential for kindling a fire… it’s essentially little wires with more resistance than they can handle. Up in flames.

It’s a credible hazard, but has an exceptionally rare occurrence. The combination of very specific circumstances and conditions required are extremely unlikely to occur, even in a kitchen “junk drawer”. There are much, much greater fire hazards in the average home. By far, the most common cause of house fires is an unattended kitchen stove top, one that has been accidentally left on (gas or electric), and deep frying cooking oil/grease fires. The second most common are electric heaters: baseboard that are blocked or covered, wall heaters. and especially portable “space” heaters (electric, kerosene and catalytic). Careless smoking remains among the top of the top ten with fires starting in bedrooms or other places smokers drowse off never to reawaken. Small appliances with heating elements (coffee makers, toasters, toaster ovens, hotplates, etc.), unattended candles, improper/damaged/overloaded extension cords or electrical wiring, improper flammable liquid storage, and improper barbecue use (especially trying to use them indoors) are all on the top ten. Nine volt battery fires attract media attention because nobody would think it possible, and that’s because they’re so rare as to be anomalous. It’s much more likely your Lithium Ion laptop battery will spontaneously ignite, and it’s those batteries, along with power tool Li-ion batteries I’d worry about regarding storage and disposal.

Wow I am skeptical too, but that is news to me 9v batteries can cause a fire. Lucky for me that has never happened. I am not sure I believe batteries might stop working after 20% loss, but I guess anything is possible. Great read.

Most smoke detectors use, you’ve guessed it, 9v batteries, wouldn’t it be truly ironic if these started a fire. btw I’ve just ripped open an AA and got covered in nasty gunk, presumably caustic, which I carefully washed off right away. There were no cell batteries inside so I’m guessing cheaper production methods have made the above hack redundant. Instead I’ve taped a couple of dead L22’s to 2 AA’s which I reckon will charge them enough to use in my multimeter til the shops open tomorrow. If not I will let you know.

I ive got a power bank that came with my tent I bought for camping. It uses 4 D batteries to power some built in LED strip lights through a USB connection, im sure that it gets.very weak to the point of not chsrging in about an hour maybe puts a charge of 40% on the phone at that point if im using it while charging even st minimum brightness or battery usage from my phone settings it will begin to die faster than its charging.

You might want to remove the “How to recharge batteries” video from your blog. While it is entertaining (I laughed many times!), it is not based on any facts of physics. Refer back to your explanation of how batteries work. The electrons need to flow from one place to another. Putting two positive ends together will not cause any electrons to flow. This could work if you also connected the negative terminals together. This puts the cells in parallel, essentially creating one larger battery of the same voltage. In this configuration, the voltage will equalize between the cells to some extent. The older or emptier cell will not be able to hold the same level of charge as the newer, fuller one because of the chemical reaction that took place during its discharge (if we are strictly talking about non-rechargeable batteries). Therefore, you will not be able to effectively charge dead batteries this way. Imagine two vacuum sealed containers of fluid, each filled to a different level. (Gravity doesn’t have the same effect on electrons as it does on fluid. For this example, the containers would have to remain upright). Connecting the tops (positive end) of the containers has no effect on the fluid. Connecting the bottoms (negative end) doesn’t either. The fluid can’t go anywhere unless the air can also flow. If you connect both top and bottom, the fluid can flow. Now imagine the emptier one is older and has some solids built up on its walls. That container won’t be able hold as much water as it used to. Also, the guy is either an idiot, or doing the video ironically. “Electrical tape is called electrical tape because it conducts electricity.” It doesn’t, that’s why it is used in applications where there is electricity present. It insulates. Impedance ratio? That is something used in calculations regarding transformers, not describing different sizes of batteries (as far as I can find anywhere on a Google search). I hope this explanation helps you improve that information that you are spreading to your followers!

You can recharge Alkaline batteries with a charger. In prison everybody did this and I never heard of one exploding or anything. I did it for years. We didn’t have proper chargers, so we put a jumper wire in our radios and other electronic to charge the batteries in the battery compartments. Normally when you plug a portable radio in, it disconnects the batteries, we would install a jumper wire so the batteries were still connected when the radio was plugged into the wall. This applied the proper amount of voltage to the batteries to charge them. The more times you recharge them this way, the less charge they will hold. I usually recharged mine a minimum of 5 times. Even though I never heard of any exploding, we only used name brand batteries, double A and D, I would recommend charging them somewhere if they did explode it will not hurt anybody or start a fire.

  • Jim Wang says December 27, 2016 at 1:58 pm

Alkaline batteries can be charged and I’m not surprised you had some success with that given the conditions, very resourceful. I think most people aren’t diligent enough to keep an eye on it and could find themselves with exploding batteries.

When you cut open a 9 volt alkaline battery you will not get 6 “AAA” batteries as the author says. What you do get is 6 “AAAA” batteries. The batteries in a 9 volt alkaline battery are smaller than “AAA” batteries and this size of battery is actually used in medical equipment. These “AAAA” batteries put out 1.5 volts just like other batteries do.

The Infinite Solutions Videos are all spoof videos. None of his videos are real. On his battery video the batteries will never “recharge” because there is no circuit. Just an FYI don’t waste your time. And Infinite Solutions videos are really great entertainment! #InfiniteSolutions #9603433

The “Infinite Solutions” video, a well know piece of satirical humor in IT / tech circles from our early internet days, is exactly that… humor. The methods to charge batteries described in that video do not work, but continue to offer a chuckle from time to time. Check out a number of his other videos for some other “amazing” solutions to problems. And, as far as internet satire goes, the guy did a fantastic job expressing his information so convincingly, as we see once again through the creation of this series of Комментарии и мнения владельцев.

You wrote: If electricity were like water flowing through a hose, the amperage is the diameter of the hose. Voltage is like water pressure on the one end, or how much you’ve opened the faucet. AAA, AA, C, and D batteries are all 1.5 volts. All the same voltage. They differ on amperage. As a result, they contain different Watt-hours (Watts is voltage time amperage) – or total amount of energy. That explains why they’re different sizes too. Don’t all 1.5V batteries have the same amperage? They would all have the same P=VI, but the larger size batteries would have higher Watt-hours. Is this correct?

You are almost there. Voltage is measured in Volt (V). Current is measured in Ampere (A) and Power is measured in Watt (W), i.e P=U x I. The current is depending on the resistance (R) in the circuit including the resistance in the battery, Ri. The relation between Voltage and Current is, U= R x I, It means you can just get the current depending on the load. If you measure an unloaded battery, you will find the maximum Voltage without load. If you shorten the battery you will get the maximum current it can produce depending on the internal resistance and the wire you are using but there wont be much voltage left. There is a optimum current outtake for all batteries where there is a decent voltage left. With a larger battery that level is higher than a small coin battery with higher internal resistance. One way to measure the performance of a battery is to tell how much power it capable of and is given in Watts (W). It is Voltage x Current. But it doesn’t say how long you can use it. By telling how much Energy is contains, E=P x t, where t is time in seconds, we get a kind of estimate given in Ws, Watt-seconds actually Joules or maybe Wh, Watt-hours as given in your electricity bill. However the relation isn’t linear between Voltage and current so at the end of a battery’s life, the voltage drops more rapidly. This is especially about Li-ion batteries but also others. The usable energy is also less of what it contains because the voltage isn’t supposed to go below typically 2.7V. It is cheating but if you know, you can deal with it.

I never would’ve thought to take out the batteries in old kids toys, especially since a lot of those batteries still have a full charge that could be used. My wife and I are trying to get rid of a lot of our son’s toys that he doesn’t like to play with anymore. I will be sure to check all of them for any usable batteries, I don’t want my wife and I to be wasteful!

We have many battery powered, short strings of lights powered by 3 AA batteries. Would slipping a piece of thin plastic between the middle battery’s terminal and its contact point in the compartment be as effective as removing the batteries?

  • Jim Wang says November 24, 2018 at 8:55 pm

Yes, that will work. That’s how a lot of small battery operated products, where the batteries are included, are packaged.

Great tips, definitely learned something today, thanks! Hate to be that guy. but they haven’t made tin foil since the war ( as an ex of mine used to always correct me!) thanks again!

I use NIMH batteries and did a lot of research on best storage practice. The following pertains ONLY to NIMH batteries. Some manufacturers say that freezing is unnecessary (even harmful), while others recommend it. The research I chose to believe recommended freezing them, but in a plastic freezer bag to avoid condensation. When taking them out of the freezer for use, they need to be brought up to room temperature. I usually wrap my hand around a battery for about 30 seconds to warm it up and then let it set aside for another 30 seconds and it is ready for use. NIMH batteries have a higher discharge rate and freezing them slows down the rate by 90%. I have been freezing them for 5 years with no adverse effects. If you Google “freezing batteries for storage” you will find several other advocates for this practice.

C vs. D Batteries: 5 Differences

Sometimes it is taxing to find the right batteries for your equipment, but doing so is crucial. C and D batteries are the most common rechargeable and non-rechargeable batteries found in most homes and offices. It can be challenging to distinguish between the two at first, but once you understand what each does and what your device requires, you’ll be good to go.

C and D batteries are dry cells often produced for medium-high drain applications, including toys, remote controls, and flashlights. Although C and D batteries may look quite similar, in reality, they differ in capacity, size, and other properties, raising the question of whether or not they may be used interchangeably and what the actual differences are.

It is crucial that you understand the various sorts, sizes, and chemistries of the batteries and how they will function on your device before you start browsing the end cap of the store where you buy your batteries and become overwhelmed by the wide variety of options available.

This article highlights the differences between the C and D batteries in terms of sizes, properties, and other features. Read on to find out how the two compare with each other.

C vs. D Batteries: Side-by-Side Comparison

C BatteriesD Batteries
Standard Voltage 1.5v 1.5v
Capacity 8000mAh Up to 20000mAh
IEC Name R14 R20
Type NiMH, NiCd, Li-ion, Alkaline NiMH, NiCd
Supported Devices Low and medium-high drain applications High drain applications
Height 49.5 ± 0.5 mm 59.0 ± 0.5 mm
Diameter 25.3 ± 0.2 mm 32.3 ± 0.2 mm
Size 50mm x 26.2mm 61.5mm x 33.2mm
Weight Lighter Heavier
Power Lower Stronger
  • 12 pack
  • All purpose
  • Alkaline batteries
  • 5-year shelf life
  • Easy to open value pack

C vs. D Batteries: What’s the Difference?


If you take a close look at the batteries, you will notice that the alphabets represent their sizes. The further away from the alphabet the battery name is, the larger it is. For instance, AAA is smaller than C batteries. In this case, D batteries are larger than C batteries. The standard size for C batteries is 50mm x 26.2mm, D batteries measure 61.5mm x 33.2mm.

Similarly, C and D batteries differ in diameter and height, with C batteries measuring less. The standard height and diameter for C batteries are 49.5 ± 0.5 mm and 25.3 ± 0.2 mm, respectively, while D batteries measure 59.0 ± 0.5 mm and 61.5mm x 33.2mm, respectively. It is important to note that these are only standard measurements; the sizes can differ slightly across different brands.


Basically, C and D batteries are 1.5 volts. This makes you wonder what the difference is. For this same reason, people think the two types of batteries can be used interchangeably.

Considering that D batteries are larger than C batteries, it goes without saying that it is impractical to use them interchangeably. D batteries cannot fit in the battery compartments intended for C batteries, and C batteries cannot fit in compartments meant for D batteries.

Supported Device

C batteries are manufactured to provide a voltage of 1.5 and less overload capacity, making them ideal for small and medium drain applications, typically smaller devices. Such devices include small flashlights, toys, and other portable devices.

On the other hand, while D batteries provide the same amount of voltage, they have higher overload capacity and are intended for high-drain applications like large flashlights, radio receivers, and alarm systems.


Since D batteries are larger than C batteries, it goes without saying that they have more weight. D batteries have an average weight of 160-180 grams, while C batteries have an average weight of 65 grams.


While the two battery types provide the same amount of voltage, they differ significantly in capacity. D batteries are larger than C batteries, storing more charge and lasting longer. This makes D batteries undoubtedly more powerful and ideal for devices that require high amounts of current.

C batteries have a capacity of up to 8,000 mAh, while D batteries have a capacity of up to 20,000 mAh. Next time you think of buying batteries, remember a battery’s capacity to store energy increases with its size. So, despite both big and small batteries being rated at 1.5V, the big battery has a larger energy reserve and a longer battery life.


How long both batteries will last depends on a number of factors, such as current draw, application, and how long you use them. Generally, though, D batteries tend to last longer as they have more energy storage than C batteries.

Note that C and D batteries made of lithium chemistry will last longer and perform better than typical batteries. D batteries will also outlast C batteries even when made of the same chemistry.

C vs. D Batteries: Which One is Better?

It all trickles down to one answer: it depends on its use. The best battery depends on the device you need batteries for and the battery compartment size. It is impractical to purchase larger batteries for a small-compartment device or purchase small batteries for a large-compartment device.

C and D batteries typically differ in capacity, size, consumption rate, and other factors. However, each is built for a suitable application scenario, preventing them from totally replacing one another.

To get the best out of your investment, go for rechargeable batteries when and where possible. This will help minimize the stress of regularly purchasing a pack that will need to be exhausted after a few months. Remember to check your device’s current and voltage requirements before purchasing batteries. It also helps to buy batteries with higher mAh ratings as they have longer run times. We recommend buying batteries from recognizable brands and avoiding generic and cheap batteries with diminished capacity. Such batteries will likely spend more time charging than in use.

C vs. D Batteries: 5 Differences FAQs (Frequently Asked Questions)

Can D batteries replace C batteries?

C and D batteries are made for different suitable applications. So, D batteries cannot replace D batteries. It is also not possible for D batteries to fit in battery compartments intended for C batteries.

Can C batteries be recharged?

Yes, you can recharge rechargeable C batteries. There are also non-rechargeable, disposable, single-use C battery variants known as primary batteries. Rechargeable batteries are recommended as they are a great sustainable choice.

What is the advantage of D batteries?

D batteries are generally larger than C batteries. They are used in high-drains power devices because they store more energy. They are likely to last longer and power devices with higher drains than C batteries. Rechargeable D batteries can last even longer.

Can D batteries explode?

It is common for batteries to explode as every battery has explosive tendencies. You should take good care of your batteries to avoid such issues by properly handling them, storing, disposing, and following the proper recycling measures.

How can I use a C battery in a D battery compartment?

While we recommend buying the correct battery for your device, there are ways you can use a C battery in a D space. Since C batteries are typically shorter and smaller than D batteries, you need to make an adapter to ensure they sit in place. You can do this by placing two quarters each on one end of the battery. However, this solution is not reliable and long-lasting and may be unsafe for you and your device.

What is battery capacity?

Battery capacity is the total amount of charge stored in a battery. It is measured in milliamp-hours. A battery with a higher capacity will have a longer running time than one with less capacity.

About the Author

Esther Rebecca

Esther Rebecca is a tech writer that is good at capturing real insights into the tech industry, and she is no stranger to topics like cybersecurity, cryptocurrencies, space, programming, and, of course, science fiction. She can also dig into the history of technology. Besides, she provides informed and comprehensive information for those who want to catch up with tech trends, AI, video games, VR/AR reviews, and the latest updates on EVs. Outside of writing, she’s a typical mom who spends her time running after her 2 year old toddler and taking care of her family. You can catch her @rebeccaesther70 on

Could You Start Your Car With D-Cell Batteries?

Can you start your car with D-cell batteries? And how many would it take? Rhett Allain takes the math for a spin.

I seem to recall a question like this in an introductory physics textbook. The basic idea was that your car has a 12-volt battery that is used to start the engine, right? Well, 8 D-Cell batteries in series will also make a 12-volt battery. However, not all 12-volt batteries are the same. The D-cells just won’t do the job of starting your car.

But why? Also, just how many D-cell batteries would you need to get your car started?

Internal Resistance

The problem is that as you increase the current out of a battery, the voltage across this battery does not stay constant but instead decreases. For example, take a D-cell and connect the negative and positive terminals with a plain copper wire. This wire has a ridiculously low resistance. Suppose the wire had a resistance of just 1 Ω, With a 1.5 volt potential difference, you would have 1.5 amps of current going through this wire. That’s pretty high for a single D-cell battery.

Then how can we model the actual voltage across a battery? The key is to model the battery as a constant change in potential along with a built in resistor in series with this. Here is my diagram of a D-cell battery.

A couple of notes about this model.

  • This is just a model. Battery makers don’t intentionally put a resistor inside of their batteries to prevent you from using them to start your car. Instead, the resistor is a way to model the limitations of the chemical reaction inside the battery.
  • I list two potentials in the diagram, Vi and Vb. Both of these are actually changes in potential. However, it is customary to drop the Δ symbol in front of the V. I don’t know why, but all the cool physicists seem to just say potential.
  • Maybe it is already clear, but Vi is the internal voltage of the battery and Ri is the internal resistance. Vb is the actual voltage across the terminals of the battery that you would measure (if you measured it).

Here is how the model works. As the current from the battery increases, the voltage across the battery would be:

This also shows why your D-cell won’t start a car. Suppose you need 200 amps going to the starter motor for it to function correctly. Even if the internal resistance is just 1 Ω, that would be a 200-volt drop inside the battery. Of course, that is larger voltage drop than the internal battery itself. Bummer.

There is a way to get 200 amps out of a D-cell. have a whole bunch of D-cells in parallel. Lets say I have 200 sets of 8 D-cells in parallel. In that case, each D-cell would only need to produce 1 amp of current. With them all together, this would be 200 amps.

Measuring Internal Resistance

There are a couple of ways to determine the internal resistance of a battery. It is easy to determine the internal voltage. All you need to do is measure the voltage across the battery while it has no load (not connected to anything). Next, hook the battery up to some low (but known) resistance. Like this.

Using the voltage loop rule, I can write:

In these two equations, there are two things I don’t know. I don’t know the current and I don’t know the internal resistance. If I solve one equation for I and substitute that into the other equation, I can solve for Ri. I get:

Just a check. This does have the correct units. Also, if the battery has a really low internal resistance, the voltage across the battery will be about the same as the internal voltage. This is essentially what this equation says.

The only thing is that to use this method, you need to know the resistance value of the load you put on the battery. There is another way.

What if I measure the current and the voltage across the battery for a variety of resistance loads? In this, case, I would expect the following relationship.

From this, I can plot the voltage across the battery as a function of the current coming out of the battery. This way I can put whatever resistors I like for a load and it just doesn’t even matter what these values are. The nice thing about this other method is that it uses more data points and ignores the resistance. If I take a 10Ω resistor and hook it up to a battery, it might not actually be 10Ω. Resistors don’t always have a constant resistance.

Now for some data. I looked at a D-cell, a AA-cell, and my 5-cell penny battery. Here is the data for just the AA and D-cell.

I am not sure why the D-cell data looks so much nicer than the AA data. For the linear fits for both sets of data, I get an internal resistance of 0.204Ω for the D-cell and 2.258Ω for the AA. I didn’t plot the data for the penny since it was way off scale. Here it is by itself.

From this data, I get an internal resistance of 66.89Ω. In general, the smaller the battery, the higher the internal resistance.

Starting a Car

What kind of current can I get from one of these batteries? Well, what if I had a perfect short circuit across one of these batteries. Suppose I have a wire with zero resistance to short the battery. In this case, the loop around the circuit would just include the internal battery and the internal resistance. The loop equation would be:

This is the highest theoretical current from this battery. Of course, this assumes two important things. First, that the internal resistance model is valid at this extreme range. Second, that you could actually find a zero-resistance wire. It would have to be a superconductor, I guess. Oh, notice that in this case the voltage across the real battery would be zero.

If I use my values for the D-cell battery, I have a maximum current of 0.7 Amps 1.5v/.204 Ohms (Hat tip to @weirdnoise for catching my error) = 7.35 Amps. Of course, I can’t get that high of a value with my starter motor since it isn’t a superconductor and has a non-zero resistance. Let me just say that I will get half this value of current. so 0.35 3.7 Amps. In this case the voltage across my actual battery would drop from 1.6 volts to 0.8 volts.

How many of these D-cells would I need in series to get up to my estimated current of 200 Amps? If each battery by itself would produce 0.35 3.7Amps, I would need 571 54 D-cell batteries in parallel. But don’t forget, I need 12 volts to start the car. So this would be 571 54 sets of 8 batteries for a total of over 4,500 432 D-cell batteries. Hint: That’s a lot.

How much space would this take up? Well, according to Wikipedia a D-cell has diameter of 33.2 mm and a height of 61.5 mm. If I stack these batteries 8 high and in rows 23 by 24 7 by 8 they would take up a volume of about 0.03 m 3. Not as big as I thought. Still it wouldn’t be so cheap to buy 4,500 432 batteries.

I will leave the penny batteries and the AA batteries calculation for homework.

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