Stay unplugged longer with ThinkPad Battery 75+ (6 cell). This rechargeable battery uses Lithium-Ion (Li-Ion) technology and can be used as a replacement for aging system batteries or as a convenient spare battery. The ThinkPad Battery 75+ (6 cell) (0A36311) features: - Lithium-Ion technology - Six-cell, rechargeable system battery, 62 Wh - Standard system battery specifications - Over-discharge protection - Output voltage: 11.1 V - Battery Performance Amp-Hour: 5.6Ah - Battery Performance Watt-Hour: 62Wh