Ultrabay Slim Battery II

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ThinkPad Advanced Ultrabay Battery

This is a battery that slides into a supported Ultrabay Slim or Ultrabay Enhanced slot


  • 10.8V Lithium-Ion
  • Capacity: 2.7Ah
  • Weight: 235g (0.52 lbs)
  • Up to 8.5 hours of battery life on select systems in combination with main battery

UltraBay Slim Battery

IBM Partnumbers

  • Order PN: 40Y6789
  • FRU PN: 40Y6790

Linux Support

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

Supported with

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.