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

Advanced Ultrabay Battery

IBM Partnumbers

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

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

Charging and discharging

See Using an Ultrabay battery.