Hand drill lithium battery pack capacity detection method:
The first step is to fully charge the lithium battery, and the voltage after a single lithium battery is fully charged is 4.2V;
The second step, use a multimeter to discharge the battery at constant current (0.5C, relative to the battery capacity), and set the termination voltage to 3v;
The third step is to multiply the constant discharge time by the discharge current to obtain the capacity of the lithium battery pack.