GoolRC RC Drone 4-port Charger With 3.7V 800mAh 25C battery for Syma X5 X5C UDI U816A U818A WLtoys V929 Cheerson CX-30 High quality and durable perfermace. Portable and easy to carry. Can charge four battery once time. Safety for the using time of battery. Can be applied for many types of RC drone.