Youcute 4pcs 3.7v 150mah Official Battery and 1to6 Charger for Udi U839 U939 Rc Quadcopter +Drone Spare Parts Over charge protection, Short circuit protection Charging 6 battery at one time Light on when charging......Light off when charge complete Works only for UDI U839 and U939. It cannot work for Eachine E010 package included : 4pcs 3.7v 150mah battery + 1to6 charger kit