GoolRC Super Fly Sets X6 Charger with 6Pcs 3.7V 500mAh Lipo Battery for JXD392/WLtoys V939/UDI U816A RC Quadcopter 6Pcs 3.7V 500mAh lipo battery. High quality and durable perfermace. X6 charger can charge six battery once time. Just need approximate 90 mins charging time. Compatible with Hubsan X4 H107 series JXD392 JXD388 V939 V202 U816 U816A.