[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 express how much amperes can be delivered for 1 hour.
That express the energy that is stored in the battery.
In your example, 2500 mAh means the battery can provide 2.5 Amperes for 1 hour.
If the device you power with it is rated for 1 Ampere, it will run for 2 and a half hours.
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