this post was submitted on 21 Oct 2023
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I can’t find an active thinkpad centric community on here I am just going to post here. My Thinkpad T480s, 16 GB RAM, 238 GB SSD is randomly shutting off while at like 50%. When I try to open it back up it always is dead and I have to connect charger to boot it up again. Why is this happening? Is it battery issue? It complains about not being able to read temp2_input while shutting down and sometimes say PM usage count underflow. Not sure what that is supposed to mean.

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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

Oh, wait. 50% and Thinkpad. I used to have a Thinkpad with two batteries.

https://www.ifixit.com/Guide/Lenovo+ThinkPad+T470S+Batteries+Replacement/140443

That looks like the T470s has a dual battery, and unlike mine, they look like they're the same size. Does your T480s have dual batteries?

EDIT: The T480 apparently does. Does the T480s?

https://www.reddit.com/r/thinkpad/comments/a4iben/t480_confused_on_how_to_charge_2nd_battery/

EDIT2: I don't see anything that looks like a second battery myself in this:

https://www.ifixit.com/Guide/Lenovo+ThinkPad+T480s+Battery+Replacement/144009

So I'm guessing not.