YouCute 2pcs 350mAh Battery and 1to3 Charger for UDI U818A WiFi FPV UDI U845 RC Quadcopter Drone Spare Parts package include : 2pcs 3.7v 350mah battery + 1to3 Charger For Udi U818A WIFI FPV RC drone For Udi U845,U845 WIFI RC drone Over charge protection, Short circuit protection,Rechargeable up to hundreds of times Light on when charging......Light off when charge complete