Serial Ultrabay Slim Battery III

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Serial Ultrabay Slim Battery III (0A36310)

This is a battery pack that slides into a Serial Ultrabay Slim, Ultrabay Slim or Enhanced with power interfacing pins.


  • Battery specification: 2.9Ah, 10.8V, 31.32Wh
  • Battery cell count: Three, 3.6V lithium-ion polymer prismatic cell
  • Battery run time: up to 2.5 hours
  • Battery charge time: up to 5 hours
  • Weight: 240 grams or 0.53 pounds

  1. This battery pack cannot be used in T4x/R5x models as they have a different battery pin layout.


Part numbers

Branded as the ThinkPad Battery 43, Sony

  • 45N1041 (45N1040)

Usage and Linux support

See How to use Ultrabay batteries.

Models supporting this accessory