I just developed a similar issue over the past week. Initially, when I upgraded (straight away) the power problem was an issue. Then I updated Windows and I was fine. But this week, the computer would charge for a brief period and then shut off. If I unplugged and plugged it in again, the charging would begin again. I did the following:
- Reset the battery, the equivalent of taking it out, waiting and putting it back in again
- Updated Windows as much as I could
- I uninstalled and reinstalled the A/C charging driver
- I changed the battery settings back to default (as I had just changed them)
- I closed all windows and saved all my work - I normally let the computer sleep whilst charging and reopen it to recommence work rather than shutting down. I then shut the computer down, allowed it to cool the battery and didn't use it for 2 days
Finally, I went to acer, installed the BIOS update literally for "Fix AC charge ignore bit. 2. Support Elantec Touchpad SP4WIP3M" . At first, this didn't work, then I shut down and restarted my computer again, and it worked!!
In order to get it to charge enough, I would shut it down or put it in sleep mode and then let it charge overnight like you did, even though it would stop charging halfway through. Quite honestly, I think Microsoft has done a terrible job of communicating exact requirements for computer drivers for running Windows 11. When I phoned Acer, they basically told me to contact Microsoft or take it to the shop I bought it from, so it's not like they are blameless - the Acer care centre app did not give any updates or advice on this issue. The Acer Community have been somewhat helpful in the initial stages.
I wonder if Microsoft could explain exactly why the ability of a computer to charge and regulate battery levels is affected by the operating system? Seems dubious to me.
Hope this was of some use!
EDIT: this BIOS update came out on the 17th of March so pretty recent