Power Drain

In the past few weeks I reinstalled Windows 11 to set up a dual boot with Ubuntu on my laptop, which all works fine. But since the reinstall I've had a few issues, one of the more noticable is the poor battery performance.

On battery I perhaps get around 1 hour and 20 minutes at the most which is so poor. Admittedly the battery on my laptop isn't 100% health since it's around 3 years old, however the power app still reports a "Good" battery state.

It seems to run hotter than before. With general use on battery the fans keep coming on & off intermittently and when plugged in pretty much constant revving from low to medium. I look in task manager and the CPU speed is jumping from 1.60 to 3.23 Ghz, but weirdly only ever around 5~13% utilisation.

Going into Settings>System>Battery I can view the apps using the most power and it reports "System" has used 53% (In use: 0% | Background 53%) which is next to useless information since it's not very specific, the next is "Windows Explorer" at 21%.

When searching around the main suggestion I get is pretty much "Enable battery saver" but I never had this issue before. Especially when Ubuntu is much better on battery with very little performance impact, I get that it uses less resources in general but something just doesn't seem right to me. I didn't have such poor battery before.

Couple of suggestions:
-Update all device drivers on your laptop
-Check & optimize the power plan settings on your pc.
-Make sure your windows is updated .
-Review & close unnecessary background processes (this helps me in the past).
-Run an antivirus scan

Hope it helps, if not maybe you should advise with the pc manufacturer