The 42v 2a electric scooter charger for  Lithium electric scooters, the connector 5.5 mm outside diameter and a 2.1 mm inside diameter(Package include a DC adapter, 5.5mm outside diameter and a 2.5mm inside diameter).
Smart Replacement charger 42V, Indication Light: Green(full), Red(charging), it stop automatically when the battery is full. The LED indicator will change red when the charger is working. The charger gets little warm during operation, you can put two small blocks under it for better heat dissipation.
Security protection: OVP(Overvoltage protection)/OCP(Overcurrent protection)/ OLP(Overload protection)/ SCP(Short-circuit protection)/ OTP(Over temperature Protection)