UDI RC 3.7V 150mAh Lipo Battery Spare Part for U839 Quadcopter Compatibility: U839 Quadcopter Capacity: 150mAh Battery Voltage: 3.7V Dimensions (L x W x H): 1.06 x 0.67 x 0.28" / 2.69 x 1.70 x 0.71cm Weight: 0.14oz / 3.97g