Ultrabay Slim Battery

Ultrabay Slim Battery This is a battery that slides into a supported Ultrabay Slim Features 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"

IBM Partnumbers

• Order PN: 08K8190
• FRU PN: 08K8191

Linux Support

Second battery is correctly detected by either the APM or ACPI subsystem. Battery charging control and extended status are provided by the tp_smapi module.

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 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.

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. The complete depletion of the Ultrabay battery also reduces its lifetime.

Help needed

It may be possible to control which battery is discharged using the tp_smapi module. If you have an Ultrabay battery, please test the dual-battery operation of tp_smapi and report your results to its author or on the discussion page.