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The battery nameplate indicates how many amps the battery has: 20Ah.

That’s 20 amp hours.

The capacity of the battery is defined in ampere-hours, and the symbol is represented by "Ah". The physical meaning can be understood as 1A discharge can last 20 hours.

Our country's battery standard is characterized by a 20-hour discharge rate, which is the time it takes to discharge 1/20 of the battery capacity and wait until the battery voltage drops to 10.5V.