Advanced Ultrabay Battery III

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Advanced Ultrabay Battery III or ThinkPad Battery 42

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: 235 grams or 0.52 pounds

Advanced Ultrabay Battery

Part numbers

Branded as the Advanced Ultrabay Battery III

  • 45K1749, 57Y4536

Branded as the ThinkPad Battery 42

  • 51J0508, 51J0507

Usage and Linux support

See How to use Ultrabay batteries.

Models supporting this accessory