What is the capacity of a battery?

The capacity of battery can be divided into rated capacity and actual capacity. The rated capacity of the battery refers to the design and manufacture of the battery to specify or guarantee that the battery should discharge a lower limit of electricity under certain discharge conditions. IEC standard stipulates that the rated capacity of Ni Cd and Ni MH batteries is the rated capacity of the battery when charged at 0.1C for 16 hours and discharged to 1.0V at 0.2C at 20 ℃ ± 5 ℃. For lithium-ion batteries, it is required to charge under the control of normal temperature, constant current (1c) - constant voltage (4.2V) h. Then, the rated capacity of the battery is the amount of electricity released when discharging from 0.2C to 2.75V. The actual capacity of the battery refers to the actual power released by the battery under certain discharge conditions, which is mainly affected by the discharge rate and temperature (therefore, strictly speaking, the battery capacity should specify the charging and discharging conditions). The unit of battery capacity is ah, MAH (1Ah = 1000mah).