Hiport Laptop Battery For Alienware Sentia 6-87-M54GS-4D3, 6-87-M54GS-4D3A, 6-87-M5S4S-4P4, 87-M54GS-4D3, 87-M54GS-4D31, 87-M54GS-4D3A, M540BAT-6, 6-87-M55NS-4C3, 6-87-M5SSS-4W4, M550BAT-6 Laptop Notebook Computers Cells: 6 Cells Volts: 11.1V Capacity: 4400mAh; 49Wh