Battery capacity is the amount of electric charge delivered between specified charged and discharged states under stated conditions. It is , commonly reported in ampere-hours; .
Capacity is distinct from delivered energy, which is . Two batteries with equal ampere-hour ratings can deliver different energies because their voltages differ. Discharge rate, temperature, endpoint voltage and aging affect the measured capacity. Comparing ratings therefore requires the same test conditions and a stated choice of active-material or full-device mass when using specific capacity.
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