Battery type: Li-ion; Capacity: 48Wh; Voltage: 10.8V ; Cells: 6-cell;Color: Black P/N: 45N1048 45N1049 45N1043 45N1042 Laptop Battery Repalacement for Lenovo Thinkpad Battery 75+ (6 Cell) - 0a36311; Lenovo B Series B590 ,ThinkPad E Series - E430, E430c ,E431, E435, E440, E445, E530, E530c, E531, E535, E540, E545 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery