Ultrabay Slim Battery

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Ultrabay Slim Battery

This is a battery that slides into a supported Ultrabay Slim.


  • 10.8V Lithium-Polymer
  • Capacity: 1.5Ah or 2.2Ah
  • Weight: 280g (0.48 lbs)
  • Charge time: 2.8 to 4.0 h
  • Battery life: "up to 2 hours without recharge", "up to 8 hours of battery life on select systems in combination with main battery"

UltraBay Slim Battery

Part numbers

  • PN (Order/FRU): (08K8190 / 08K8191), (08K8190 / 08K8189), (41A4118 / 41A4117)

Usage and Linux support

See How to use Ultrabay batteries.

Supported with

NOT supported with

A note on capacity

The capacity of this battery is 1.5Ah or 2.2Ah. For comparison, in the ThinkPad T40 series, the 6-cell system battery has a capacity of 4.8Ah and the 9-cell system battery holds 7.2Ah. Thus, the Ultrabay battery provides only a small improvement in total charge capacity.