Chosen Solution
Got a battery kit for iFixIt, and it seemed everything worked just fine, no problem during the swap. But when booting, now macOS panics after a while, and the Windows partition that was there too boots fine but with quite a few video artifacts. It makes me think macOS panis when switching to the graphics card but not really sure. I had a USB key with VMware ESXi on it and that one boots just fine, I don’t think it’s using the graphics drivers at all. Booting lid closed on an external monitor has the same symptoms. Any ideas ?[EDIT] Tried resetting NVRAM and SMC without success Update (09/02/2021) Here is a snap of the last line before crash
Have you tried resetting the NVRAM / PRAM? This could solve the issue, but be aware that it also resets some minor preferences (see last bullets in the link). If you suspect the graphics card to be the culprit, do you have a dedicated graphics card and are you running some kind of CUDA drivers? They might get reset as well so make sure you are using the most recent drivers depending on your OS. BTW, which MacOS version are you running?
It appears the NTFS volume has a corruption! You’ll need to boot up under macOS and make sure the GUID volumes are in good order using Disk Utility. Then reboot under Windows and use Disk Management to repair the NTFS volume.