Ultrabay Slim Battery II
- Order PN: 40Y6789
- FRU PN: 40Y6790
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.
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.