Youcute 2pcs 3.7v 1000mah Official Battery and 1to3 Charger for Udi U842 U818S Rc Quadcopter Drone Black Spare Parts Package included:2pcs 1000mah battery and 1to3 Charger For Udi U842 Charging 2 batteries at the same time Over charge protection, Short circuit protection. Light off when charge complete