The quantity of electricity that a battery can delivery during single discharge until its terminal voltage falls to 1·8 V/cell is called the capacity of a battery.
The capacity of a battery or cell is commercially expressed in ampere-hour and is generally denoted by A-H.
Capacity of a battery or cell = IdTd ampere-hour
Where
Id = discharging current in ampere
Td = discharging time of battery or cell in hour.
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