Ultrabay Slim Battery

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

This page covers Slim Battery 08K8190, but there is also P/N 08K8191 available with a capacity of 2.2 Ah.

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
• ThinkPad Z60t

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.