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Excalibure
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Posts: 7
Registered: ‎07-22-2019
Location: GB
Views: 237
Message 1 of 7

Thinkpad T480s battery drain while plugged in

I have a T480s ( product number 20L8S5F206) that I have from new for several weeks now. I noticed that the battery is draining while the laptop is connected to the charger.

The charge thresholds are 40-80 as shown in the attached screenshot.

I tried to disconnect the charger, use the laptop till it gets below 40 and then keep it on charge. It can get up to 79% and then starts draining.

Any idea on what to do?

P.S. I have done a battery gauge reset on the 24th of June.

 

 

 

battery drain.png

 

 

 

Lenovo Staff
Lenovo Staff
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Registered: ‎10-29-2009
Location: NC
Views: 231
Message 2 of 7

Re: Thinkpad T480s battery drain while plugged in

Does this drain happen while system is turned on, or while system is sleeping?  What is the rate of the drain?

 

Excalibure
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Message 3 of 7

Re: Thinkpad T480s battery drain while plugged in

The drain happen as the system is ON.

The rate is not constant. it can take 30 minutes to drop 1% from 77% to 76% and then an hour to drop from 76% to 75%

Lenovo Staff
Lenovo Staff
Posts: 5,874
Registered: ‎10-29-2009
Location: NC
Views: 201
Message 4 of 7

Re: Thinkpad T480s battery drain while plugged in

I checked my T480s by setting a 40/80% charge threshold.  The battery was already at 100% so I let it drain to 71% then plugged it in.  Now it has stayed at 71% for the last 90 minutes so I don't think I'm seeing the problem you reported.  Is there any possibility that your AC adapter is going bad?  Do you have another one you can try?  I can't think of what else could cause this kind of problem.

 

Does the same problem happen if you set a different charge threshold, such as 85/95%?

Excalibure
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Registered: ‎07-22-2019
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Message 5 of 7

Re: Thinkpad T480s battery drain while plugged in

The AC adapter is definitely on the suspect list. However, I do not have another one to test.

I am currently using the 45W charger and my Laptop's specs are:

 

Core i7-8650U 

Touchscreen

256GB SSD

16 GB RAM

 

Maybe this kind of specs require the 65W adapter? 

If yes, then why Lenovo didn't ship one by default?

 

I haven't tried other threshold settings. Will def try that as well.

 

btw, I have been using the laptop for more than 2 hours now and it is still at 69% charge (was using it on battery power for a few minutes earlier). The number didn't drop yet from 69, this is driving me nuts as I really can't figure out why it went Smiley Frustrated

Excalibure
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Posts: 7
Registered: ‎07-22-2019
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Views: 171
Message 6 of 7

Re: Thinkpad T480s battery drain while plugged in

Please find the battery report, I hope this helps

 

Mo88
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Registered: ‎09-02-2019
Location: GB
Views: 87
Message 7 of 7

Re: Thinkpad T480s battery drain while plugged in

Hi 

Have you managed to find a solution. I am facing the same problem. I have brand new t480s and battery percentage decreses by 1% every couple of hours. I also have 45W charger which came in the box. My laptop has i7-8650u, intel graphics card and FHD.

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