Battery For Dell Alienware M17x, MX17 R2 85WH 9-Cell Li-ion 85WH 11.1V Rechargeable Laptop Notebook Battery Charger Compatible Part Numbers: F310J, W075J, C852J, 312-0944, H134J Battery for Dell Alienware 85WH Type F310J Rechargeable Li-ion 9-Cell Battery For Alienware M17x, MX17 R2 Laptop Systems Compatible With: Dell Alienware M17x, M17x R2 Notebooks Wattage: 85WH / Rechargeable Li-ion | 11.1V Compatible Part Numbers: F310J, W075J, C852J, 312-0944, H134J