Genuine Dell OEM Lithium-Ion battery for the Alienware 13 R2 Laptops. Compatible Dell Laptops: Alienware 13 R2 Product Specifications: Rating: 15.2V Capacity: 62Wh mah Technology: 8-cell Li-Ion DP/N: 2VMGK; 257V0 Type: N1WM4, 0N1WM4