High Capacity Laptop Battery for Dell 640M 9 Cells 11.1V 6600mAh/73wh, compatible partnumbers: Y4493, 312-0373, UG679, 312-0450, DH074, 312-0451, 451-10284, 451-10285, 451-10351, C9551, RC107, TC023, Y9943 , fit models: Dell Inspiron 630M, Inspiron 640M, XPS M140 Series, Inspiron E1405 High Quality Laptop Battery 9 Cells, Li-ion, 11.1V 6600mAh/73wh - black 1 Year warranty