Battery capacity refers to the amount of electricity stored by the battery. The unit of battery capacity is "mAh", and the Chinese name is milliampere hour (for convenience when measuring large capacity batteries such as lead-acid batteries, "Ah" is generally used, and the Chinese name is ampere hour, with 1Ah=1000mAh). If the rated capacity of the battery is 1300mAh, that is, 130mA current is used to discharge the battery, then the battery can continue to operate for 10 hours (1300mAh/130mA=10h); If the discharge current is 1300mA, the power supply time is only about 1 hour (the actual working time may vary due to individual differences in the actual capacity of the battery). This is an ideal analysis. The actual current of a digital device during operation cannot always be constant at a certain value (taking a digital camera as an example, the working current may change significantly due to the opening or closing of LCD screens, flash lights, and other components). Therefore, the power supply time that a battery can provide to a certain device can only be an approximate value, and this value can only be estimated through practical operating experience

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