GoolRC Super Fly 4-port Fast Charger Sets with 3.7V 750mAh Lipo Battery for RC Helicopter / Quadcopter JST Charging Cable for WLtoys V636 V686 V686G High quality and durable perfermace. Portable and easy to carry. X4 charger can charge four battery once time. Safety for the using time of battery. Can be applied for many types of RC vehicle.