What’s the difference between all the different battery sizes? Why do some need AA and others AAA?
In: Technology
They are just different sizes. AAs hold more power so they last longer, and offer a better value, if you have room for them. AAAs are smaller, so if you don’t have enough space to hold AAs, you can use AAAs instead.
Most common batteries such as AAs and AAAs have the same voltage, about 1.5v each. If you need more voltage than this, you may need to add multiple batteries together. 3x AAAs could give you 4.5v for example (when fully charged) so if your device requires 4.5v, you need at least that many.
They are still just different sizes, though. If you need 3 batteries minimum due to a voltage requirement, you may use 3x AAAs because this is small. But if you wanted the device to run longer and need replacement less often, you could design it to hold 3x AAs instead. The only issue is, AAs are larger (they are also more expensive to buy, so if a company is including batteries they may want to use smaller ones, but it saves the user money in the long term by not requiring replacement as often)
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