Ultrabay Slim Battery

This is a battery that slides into a supported Ultrabay Slim

Features

10.8V Lithium-Ion
Capacity: 1.5Ah
Weight: 280g (0.48 lbs)
Charge time: 2.8 to 4.0 h
Up to 8 hours of battery life on select systems in combination with main battery

IBM Partnumbers

Order PN: 08K8190
FRU PN: 08K8191

Linux Support

Second battery is correctly detected by either the APM or ACPI subsystem

Supported with

ThinkPad T40, T40p, T41, T41p, T42, T42p, T43, T43p

NOT supported with

UltraBase X4, ThinkPad X4 Dock

A note on capacity

The capacity of this battery is 1.5Ah. 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.

Using the UltraBay Slim battery for hot-swapping the system battery

When the UltraBay Slim battery is inserted and charged, the system battery can be hot-swapped (i.e., replaced without the need to reboot, hibernate or use an external power adapter). However, the laptop will completely deplete the UltraBay battery before using its system battery, so to make hot-swapping useful you'll need to keep the UltraBay Slim battery outside the UltraBay during normal battery-powered usage.

Ultrabay Slim Battery