Battery for DELL Alienware M17x R3 Alienware M17x R3-3D Alienware M17x R4 Compatible with the following devices Alienware M17x R3, Alienware M17x R3-3D, Alienware M17x R4 Compatible with Battery Part Numbers BTYVOY1 Capacity: 10.8V 6600mAh / 71.28Wh…