[ELI5] Why are battery capacities expressed in Ah (Amperes-hour) and what does it mean, for example, a AA battery that is 2500 mAh?
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It’s the amount of charge the battery contains. An ampere is a measure of current – the charge flowing through a wire in a unit of time. So multiplying amperes by hours gives current per unit time multiplied by time, which is just current. They could give the battery’s capacity in coulombs, which is the unit for charge, instead. But they tend not to.
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