The battery for the Alienware M17x BTYVOY1 series laptop comes in two different shapes. In order to ensure that you receive the correct battery you should take your battery out and compare it to the picture above. The Alienware M17X laptop was sold as four different revisions. This battery only fits the R3 and R4 versions of the M17x.
This BTYVOY1 battery replacement is 100% compatible with the original Alienware battery specifications and is individually tested and backed by a 1 year warranty.