What is the capacity of a battery?

　　The capacity of a battery can be divided into rated capacity and actual capacity. The rated capacity of a battery refers to the minimum amount of electricity that should be discharged under certain discharge conditions when designing and manufacturing the battery. The IEC standard specifies that the rated capacity of nickel cadmium and nickel hydrogen batteries is the amount of electricity released when charged at 0.1C for 16 hours and discharged at 0.2C to 1.0V in an environment of 20 ℃± 5 ℃, 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) controlled charging conditions, and then discharge the battery at 0.2C to 2.75V as its rated capacity. The actual capacity of the battery refers to the actual amount of electricity discharged under certain discharge conditions, which is mainly affected by the discharge rate and temperature (therefore strictly speaking, the battery capacity should indicate the charging and discharging conditions). The unit of battery capacity is Ah, mAh (1Ah=1000mAh)

　　When discharging a rechargeable battery with a high current (such as 1C or above), the "bottleneck effect" caused by excessive current leads to the internal diffusion rate, causing the battery to reach the terminal voltage before the capacity can be fully discharged. It can continue to discharge with a low current (such as 0.2C) until the capacity released at 1.0V/branch (nickel cadmium and nickel hydrogen batteries) and 3.0V/branch (lithium batteries) is called residual capacity.

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