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The capacity of a lithium battery refers to the amount of electricity it can hold, usually measured in ampere hours or milliampere hours. For example, a lithium battery capacity of 500mAh means that if the current is 10mA during operation, the battery can work continuously for 50 hours.

The capacity test of lithium batteries is based on the full charge voltage and the set termination voltage as parameters. Since the minimum discharge voltage of lithium batteries is 2.75V, voltages less than 3V are no longer meaningful for lithium battery testing; Fixed current discharge is generally expressed in C, while lithium batteries are typically tested with 0.5C discharge.

1. Fully charge the battery, and the voltage of a single lithium battery after being fully charged is 4.2V;

2. Using a multimeter, the constant current of the lithium battery is 0.5C, and the discharge voltage is set to 3V relative to the battery capacity;

3. The battery capacity is calculated by multiplying the discharge current by the time of constant current discharge; Inspection: If the constant current discharge cannot reach two hours, then the nominal voltage is not enough, and there is a possibility of counterfeit lithium batteries.

If it is an individual, find an adjustable load resistor and a current adjustable DC power supply to calculate battery capacity based on charging and discharging time. Charging current x charging time=battery capacity (charging from 2.7V or 3.0V to 4.2V) or discharging current x discharging time=battery capacity.

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