Question

What is the difference between AG12 and AG13 batteries?

Answer 1

A five cell penny battery can last up to 6 1/2 hours providing minimal voltage. The stack of cells is also known as a voltaic pile.

Penny battery - Wikipedia

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Alternatively referred to as a button cell or watch battery, a coin cell battery is a battery for retaining important system settings while a device is off. For instance, it provides power to the system clock so that the computer can remember what time it is after being powered off.Apr 26, 2017

What is a Coin Cell Battery? - Computer Hope

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AG12 (LR43) is 4.2mm thick. AG13 (LR44) is 5.4mm thick. As you'd expect capacity is greater for the larger battery. AG12 = 55 mAh, AG13 is 60 mAh.