It seems like your Windows power plan is automatically changing to “Performance” when you unplug your device, which can lead to faster battery drain. Here are some steps you can try to resolve this issue:
Change Power Plan Profile: You can try changing your power plan profile in Windows. To do this, open Settings, click on System, and then click the Power & battery page on the right side.
Check BIOS/UEFI Settings: Sometimes, power settings can be affected by your BIOS/UEFI settings. You might want to check these settings to see if there’s anything that could be causing this issue.
Reinstall Windows: If all else fails, you might want to consider reinstalling Windows. This can often resolve a wide range of issues.