Ultrabay Thin Battery

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ThinkPad Battery 50

This is a battery pack that slides into an Ultrabay Thin.


  • Battery specification: 2.12Ah, 11.2V, 23.74Wh
  • Battery cell count: Three, 3.73V lithium-ion polymer pouch cell
  • Battery run time: up to 2 hours
  • Battery charge time: up to 4 hours
  • Weight: 200 grams or 0.44 pounds


Part numbers

Branded as the 3 Cell Li-Polymer Bay Battery

  • 42T4520

Branded as the ThinkPad Battery 50

  • 43R1966

Usage and Linux support

See How to use Ultrabay batteries.

Models supporting this accessory