The ThinkPad Battery 66+ (6 cell) (0A36287) features: Lithium-Ion (Li-Ion) technology Six cell, rechargeable system battery Lithium Prismatic (Li-Prismatic) Output voltage: 11.1 V dc (nominal) Battery Performance Amp-Hour: 3.9Ah Battery Performance Watt-Hour: 44Wh Standard system battery specifications Over-discharge protection Compatible with ThinkPad External Battery Charger

Physical specifications
ThinkPad Battery 66+ (6 cell) (0A36287): Approximate height: 13.19 mm (0.52 in) Approximate width: 220.49 mm (8.68 in) Approximate depth: 75.64mm (2.98in) Weight: 300 g (0.67 lb) ThinkPad Battery 66+ (6 cell) (0A36287) packaged in a carton: Approximate height: 48 mm (1.89 in) Approximate width: 295 mm (11.62 in) Approximate depth: 132 mm (5.20 in) Weight: 410g (0.91 lb)