When the charger itself is damaged, the charger with the same original capacity and voltage value can be directly replaced; If the plug is not in good contact, it can be soldered and insulated again with an electric soldering iron; If the wire is broken, you can replace the connecting wire. Check the charging socket of the machine. If the rechargeable battery loses its charging ability, it can be replaced according to the model and specification of the original battery, generally 3.7V 18650 battery.