Single battery, single battery, and battery pack: Single battery (Cell) refers to a battery with an electromotive force of around 2V (lead-acid), 1.2V (nickel hydrogen), or 3.6V (lithium battery), which is the basic unit that constitutes a single battery; Several individual batteries are packaged to form a single battery, abbreviated as a Battery; A battery pack is composed of several batteries connected in series.

　　Battery capacity: refers to the amount of electricity that can be obtained from a battery under certain discharge conditions. A battery has theoretical capacity, actual capacity, rated or nominal capacity, and rated reserve capacity. Expressed in Ah (ampere hour) and mAh (milliampere hour).

　　Theoretical capacity: Theoretical capacity refers to the assumption that all active substances participate in the flow forming reaction of the battery

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