Compatible Models: Dell Latitude E5440 Series, Dell Latitude E5540 Series Compatible part numbers 451-BBID, 451-BBIE, 451-BBIF, FT6D9, 3K7J7, 970V9, 9TJ2J, N5YH9, VJXMC, VVONF, M7T5F, WGCW6, 0K8HC, 1N9C0, 7W6K0, F49WX, NVWGM, CXF66 Specifications: - Battery type: Li-ion - Voltage: 11.1 - Capacity: 4400 mAH - Brand: Unbranded /OEM What's in the box 1 X Dell E5440, E5540 Ok8HC Compatible Laptop Replacement Battery