BTG 3.7V 750mAh 35C Upgrade Battery (4pcs) + 4in1 X4 JST Charger for Dromida Ominus Nine Eagles Galaxy Visitor 6 F15 Quadcopter FOR SAFETY PURPOSE, PLEASE READ "CAUTION" OF THE BATTERY BEFORE USE!!! Upgrade: 3.7V 750mAh35C Li-po Battery 4in1 JST Charger: Can charge 4 batteries at one time Compatible with Dromida Ominus Nine Eagles Galaxy Visitor 6 F15 Quadcopter Package inclduing: 4x batteries; 1x 4in1 JST charger