Method one, self-discharge test The self-discharge test of nickel-cadmium and nickel-metal hydride batteries is: because the standard charge retention test time is too long, a 24-hour self-discharge is generally used to quickly test its charge retention capacity, and the battery is discharged at 0.2C to 1.0V. 1C charge 80 5 minutes, put it aside for 15 minutes, discharge at 1C to 10V, measure its discharge capacity C1, and then charge the batt...