ThinkPad Battery 27++

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ThinkPad Battery 27++ (57Y4545)

This is a battery pack that attaches to the docking port of a supported model.


  • Battery specification: 8.4Ah, 11.1V, 93.24Wh
  • Battery cell count: Nine, 3.7V lithium-ion cylindrical cell
  • Battery run time: up to 9 hours
  • Battery charge time: up to 5 hours
  • Weight: 610 grams or 1.35 pounds

  1. This battery cannot be used with a W530, T430, T430i, T530, or a T530i, as the battery controller isn't recognized by the aforementioned models.

Thinkpad battery 27++.jpg

Part numbers

  • 42T4739 (42T4740)

Models supporting this accessory