Wwman 2pcs 3.7v 1000mah Official Battery and 1to3 Charger for Udi U842 U818S Rc Quadcopter Drone Black Spare Parts Charger DescriptionInput:DC5.0V-0.5-2.7A;Output:DC3.7V-450MA/SET. for Udi U842 U842-1 U818S Charging 3 batteries at the same time,Over charge protection, Short circuit protection light on when charging...light off when charge complete package included:2pc 3.7v 1000mah battery + 1to3 charger(black)