The ThinkPad Battery 29+ (6 cell) features:
Lithium-Ion (Li-Ion) technology
Six-cell, rechargeable system battery
Lithium Cylindrical (Li-Cylindrical)
Output voltage: 11.1V dc (nominal)
Battery Performance Amp-Hour: 5.6Ah
Battery Performance Watt-Hour: 63Wh
Standard system battery specifications
Over-discharge protection
Approximate height: 22.79 mm (0.90 in)
Approximate width: 208.75mm (8.22in)
Approximate depth: 55.08 mm (2.17in)
Weight: 345 g (0.76 lb)