3PCS Keenstone UDI U818A WiFi FPV U845A U945 WiFi Rc Quadcopter Drone 3.7V 400mah Battery with Charger (U818A+Charger) 6 Pcs of keenstone 3.7V 650mAh 20C LiPO Battery for UDI U817 U817C U817A U818A WLtoys Quadcopter V959 V969 V979 V989 V999 V929 V949 V212 V222 .Not compatible for UDI U818A WiFi FPV This Fast smart Charger can charge up to 6 packs (3.7V Batteries) at the same time Guarantee more flight time,high drain lithium-polymer rechargable battery Keenstone 450mA Fast and Intelligent CCCV Mini Charger compatible with most Micro RC Helicopter & Airplane 1S Batteries: UDI U815, U816A, U818A; Wltoys V929, V949, V959; Deliver powerful output with 4 high performance Mosfets.Intelligent chipset provides overcharge/overdisacharge protection.Patented design to avoid crash of your drones.