The method of charging the battery pack normally is as follows:
First connect the charger to the charged battery pack, then connect the charger power plug to the 220V AC power supply. (This connection sequence will avoid the spark generated when the charging plug is plugged or unplugged.) When the power is turned on, the charger displays a red indicator light indicating that the battery pack is charging normally. Normally, it can be charged for 6-8 hours.