What Is the Capacity of the Battery?

The battery capacity is divided into rated capacity and actual capacity.

The rated capacity of the battery refers to the minimum amount of power that should be released under certain discharge conditions stipulated or guaranteed during the design and manufacture of the battery. The IEC standard stipulates that nickel-cadmium and nickel-metal hydride batteries are charged at 0.1C for 16 hours and discharged at 0.2C to 1.0V at a temperature of 20°C ± 5°C. The battery’s rated capacity is expressed as C5. For lithium-ion batteries, it is stipulated to charge for 3 hours under normal temperature, constant current (1C)-constant voltage (4.2V) control charging conditions. And then discharge at 0.2C to 2.75V when the discharged electricity is its rated capacity.

The actual capacity of the battery refers to the actual power released by the battery under certain discharge conditions. And it’s mainly affected by the discharge rate and temperature. Therefore, strictly speaking, the battery capacity should specify the charge and discharge conditions. The unit of battery capacity is Ah, mAh (1Ah=1000mAh).

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