YouCute 6pcs 3.7V 450mAh Battery and charger for Udi U27 U941 U941A U841 U843 U842 FPV U28-1 transmitter RC quadcopter drone spare parts Package included:6pcs 3.7V 450mAh Battery + charger For Udi U27 U941 U941A U841 U843 U842 FPV U28-1 transmitter RC Drone Over charge protection, Short circuit protection. Light in Green when charging,light off when charge complete Charging 6 batteries at the same time