3.7V 300mAh Li-Po Battery for JXD 388 RC Quadcopter Spare (Silver) It is a great battery set to power your JXD 388 RC quadcopter Capacity: 3.7V 300mAh Color: Silver Dimensions: (1.46 x 0.79 x 0.28)" / (3.7 x 2 x 0.7)cm (L x W x H) Package Includes: 1 x Battery