Linux

Sounds like one of the cells has died; fully agree that it's best to replace the battery (given its 7th gen, I doubt it's still under warranty).

Alternatively, if you like tinkering with stuff just for the sake of it, you can replace the offending cell (often slightly expanded compared to the rest of them), or all 3/4 of them: in my experience, replacing only the dead one results in another one dying relatively soon after, but may still be a viable temporary solution if you're short on money or have something of similar size lying around. Also, if you decide it sounds fun, be sure to look up how-to's, as just disconnecting a cell will make most BMSes lock themselves + possibly burn the fuse, and you probably don't want to play the game of "is this BMS unlockable without paying 100500 kilomoney for specialized equipment"

You need a new battery. Don’t try to fix the problem. Replace the battery.

Batteries dont always decline at an expected rate sometimes they just fail when yesterday they worked fine. Sounds like u need a new battery.

43% health?? Sounds like a faulty battery, probably still under warranty if you've only had it for a few months (< 1 year).

Warranty instructions: https://frame.work/warranty

A couple things to check using a quick bash script:

#!/usr/bin/env bash

cd /sys/class/power_supply/BAT*/
echo "Charge cycles: $(cat cycle_count)"
printf '%s\0' 'Health: ' &
bc <<< "scale=3; ($(cat charge_full) / $(cat charge_full_design)) * 100"

That should print out the wear cycles the battery has endured and its reported capacity over design capacity. If your battery has less than 1000 cycles and the health reported from the battery is less than 80%, it might be best to contact Framework for warranty replacement as the battery is likely defective.

I feel like this is a case for framework support. They were better than your generic IT team when I interacted with them. Maybe they have a better idea of what is going wrong.

Few things:

• What is the output wattage of your charger? You need something that can keep up with the output of the battery, so Id guess 85W or higher while gaming or under heavy util.
• ensure your CPU governor didn't get locked to 'performance' mode after gaming. Make sure you have power-profiles-daemon or similar installed to switch profiles.
• run the reset process for the battery from Framework. You may just have. Battery that crapped out.

The battery health indicator could be wrong, does it still run as long as it used to?