3.7V 150mAh Replacement Battery Part for HAK903 2.4GHz 4CH RC Nano Quadcopter, 6 Axis Gyroscope, Rechargeable, Ready To Fly, Micro Quadcopter by Haktoys Package contents: 1 x 3.7V 150mAh Replacement Battery For HAK903 2.4GHz 4CH RC Nano Quadcopter, 6 Axis Gyroscope, Rechargeable, Ready To Fly, Micro Quadcopter