YouCute 4pcs 3.7v 200mah Official Battery and 1to6 Charger for syma X13 X11 X11C Rc Quadcopter Drone Spare Parts official battery for SYMA X11 X11C X13 Charging 6 batteries at the same time,Over charge protection, Short circuit protection Light on when charging......Light off when charge complete package included:4pc 3.7v 200mah battery + 1to6 charger