![]() The first letter indicates the chemical composition, while the second indicates the shape. ![]() These batteries typically include two letters followed by four numbers. Sizing for coin cell batteries (also called button cell batteries) works a little differently. AA, AAA), the more times it’s used, the smaller the battery (eg. When you see a letter used more than once (eg. Basically, the farther you get through the alphabet, the larger the battery (e.g. You’re probably familiar with AAA, AA, C and D batteries. If you want to know a little more about battery sizes, here’s a quick primer: If you don’t already have batteries installed, look on the device for some indication or check the instruction manual. if there are AAA batteries in there, then that’s what size you need to buy). Figuring it out can be as easy as looking at the batteries currently in your device and replacing them with the same size (i.e. ![]() You don’t need to know much about batteries to get the right size for your device. If you’re interested in portable solar chargers and rechargeable battery packs, see our article, Solar Chargers and Portable Power.
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