For example, what is the battery capacity of this mobile phone; The battery capacity of this electric vehicle is specific to different batteries. The battery voltage has been determined without considering the actual voltage. Simply stating ampere hours can represent the capacity of this battery.

　　However, for batteries with different voltages, we cannot simply use ampere hours to represent capacity. For example, a 12V 20AH battery, a 15V20AH battery, even if they are both 20AH, can supply the same power load, and the equipment can work normally, but the duration is different. The standard capacity used should be in units of power.

　　For example, if a device can support both 12V and 24V, and is powered by a 12V (20AH) battery that can provide one hour, then connecting two in series will result in 24V (20AH). The ampere hour does not increase, but the duration will double. Therefore, the capacity should be considered based on the power contained by the battery at this time, rather than simply considering ampere hour.

　　W (work)=P (power) * T (time)=I (current) * U (voltage) * T (time)

　　Discussing battery capacity in this way has practical significance and must be realistic, otherwise there may be a claim that a mobile phone battery has a larger capacity than a battery car battery, which is obviously not scientific.

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