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ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
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1 Posts

04-10-2017

IN

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  • Message 11 of 13

Re:Lenovo T420s "No battery is detected"

2020-10-18, 5:27 AM

Sir when i plugged in my adapter i am seeing message plugged in and not charging,.What should I do?

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51 Posts

09-01-2015

CA

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  • Message 12 of 13

Re:Lenovo T420s "No battery is detected"

2020-10-18, 23:13 PM

I had the same problem with several batteries, all not being detected.  The problem is the power connector.  The power connect on the laptop and the battery is badly designed.  Check the contacts on the connector on the laptop and make sure they are straight and nothing is missing and the connector is not loose.  Fix any problems you see.  Then do the same for the battery connector.  

 

The battery connector is on a spring and can be pushed back.  So if the contacts don't align 100%, the battery connector is pushed back, even though the battery is seated in the laptop, and it clicks in place.

 

After aligning my contacts, my T540 laptop detected the battery and I had no more problems.

 

The power connector is poorly designed and cheap and Lenovo should do something about it.

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51 Posts

09-01-2015

CA

113 Signins

581 Page Views

  • Posts: 51
  • Registered: ‎09-01-2015
  • Location: CA
  • Views: 581
  • Message 13 of 13

Re:Lenovo T420s "No battery is detected"

2020-10-18, 23:15 PM

Problem is the power connector on the laptop, and maybe the battery.  Please read my other reply.

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