What Is a 24-hour Self-Discharge Test?

The 24-hour self-discharge can quickly test its charge retention capacity. Discharge the battery at 0.2C to 3.0V, charge at constant current and constant voltage to 4.2V with 10mA cut-off current. Then, leave it for 15 minutes. And discharge the battery at 1C to 3.0V to measure its discharge capacity C1. Then charge the battery with constant current and constant voltage 1C to 4.2V, with cut-off current: 10mA. After 24 hours of storage, measure 1C capacity C2. C2/C1*100% should be greater than 99%.