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Lenovo ThinkPad T540P Battery Replacement

Kelton W. and 2 other contributors

Last updated on Dec 16, 2025

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1 minute

Very easy

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Introduction

Go to step 1 ↓

If your ThinkPad T540p laptop isn’t turning on or maintaining a charge after the power connector is unplugged, use this guide to replace the laptop's battery with no tools.

As devices age, their batteries degrade as a result of general use and letting the battery fully discharge. Over time this causes the battery to hold less and less capacity and eventually hold no charge.

Before beginning, make sure to power off the laptop completely and disconnect it from the charger.

Warning: Swollen batteries are fire hazards and need to be handled with caution. For more reading on this topic, check out this page on the proper procedure when dealing with this scenario: What to do with a swollen battery - iFixit

What you need

Parts

Lenovo 45N1151 Battery - 45N1151
5

1. Step 1 Battery
  Before proceeding, power down the laptop and unplug the device from the power supply / charger.
  
  Flip the laptop over so the bottom is showing.
  
  Orient the laptop so that the the battery bump is facing away from you.
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3. Step 2
  On the back of the laptop are two sliding locks for the battery. These are located just beneath the battery and are marked with a little lock icon on either end.
  
  Using both hands, pull these sliding locks away from each other.
  
  They will stay in place once they have been fully engaged.
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5. Step 3
  Push the battery in the direction away from where the sliding tabs are.
  
  If the battery does not slide out, make sure the sliding locks are fully engaged.
  
  To install a new battery, slide the battery back in with the sticker side of the battery facing down, and in the same orientation that it came out in.
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Conclusion

To reassemble your device, follow the above steps in reverse order.
For optimal performance, after completing this guide, calibrate your newly installed battery.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.