YouCute 2pcs 3.7v 1000mah Official Battery and 1to3 Charger for UDI U842 U818S Rc Quadcopter Drone White Spare Parts Package included:2pcs 3.7v 1000mah Official Battery and 1to3 Charger For Udi U842 U818S Rc Drone Charging 3 batteries at the same time Over charge protection, Short circuit protection. Light in Green when charging,light off when charge complete