Battery specs here...

[nickpoore]

FYI.

From: http://www-306.ibm.com/pc/support/site. ... MIGR-62735

The battery pack is an internal power source to the computer when the ac adapter is not available. The battery pack is rechargeable and is charged using the ac adapter with the system.

Weight
Four cell Slim Line Li-Ion battery pack: 200 g (0.44 lb)
Four cell Enhanced Capacity Li-Ion battery pack: 260 g (0.57 lb)
Eight cell High Capacity Li-Ion battery pack: 475 g (1.05 lb)
Four cell Extended Life battery: 370 g (0.82 lb)

Capacity
14.4V, 2.0Ah, 4 cell Slim Line battery
14.4V, 2.6Ah, 4 cell Enhanced Capacity battery
14.4V, 5.2Ah, 8 cell High Capacity battery
14.4V, 1.95Ah, 4 cell Extended Life battery

Charging
2.5hr, 4 cell Slim Line battery
3.0hr, 4 cell Enhanced Capacity battery
4.0hr, 8 cell High Capacity battery
2.5hr, 4 cell Extended Life battery

Operation
Up to 3.0hr, 4 cell Slim Line battery
Up to 4.0hr, 4 cell Enhanced Capacity battery
Up to 8.0hr, 8 cell High Capacity battery
Up to 3.0hr, 4 cell Extended Life battery
Up to 11.0hr, 8 cell High Capacity battery + Extended battery