BTG 4PCS 3.7V 750mAh Battery + X4 JST Charger for Holy Stone HS110 HS200 HS120 HS130 X300C X400C MJX X400W Sky Viper S670 V950hd s1750 V2450 Syma X56W FOR SAFETY PURPOSE, PLEASE READ "CAUTION" OF THE BATTERY BEFORE USE!!! Compatible with RC Drones (including but not limited) Holy Stone HS110 HS200 HS120 HS130 X300C X400C MJX X400 X400W Sky Viper S670 V950hd s1750 V2450 Syma X56W Upgrade 3.7V 750mAh Rechargeable Li-po Battery with JST plug 4in1 JST Charger: Can charge 4 batteries at one time Package List: 4x batteries; 1x 4in1 JST charger