YouCute 4pcs 3.7V 600mAh Official Battery and 1to6 Charger for syma X9 Flying car RC Quadcopter Drone Spare Parts Package included : 4PCS 3.7v 600mah battery + 1to6 charger kit For syma X9 flying car RC Drone Charging 6 batteries at the same time Over charge protection, Short circuit protection. Light in Green when charging,light off when charge complete