I got a 9 cell battery recently which seems to have messed up my PC.

When I inserted the battery and charge to 100%, I removed it to see how long it is going to last on battery, the laptop worked fine for some minutes but had the screen flickering after a while.

I turned off the PC and ran on battery again, the issue repeated itself, I thought it could be an issue with the drivers - so I updated all my drivers mostly battery and graphics related ones without success.

Now I figured the issue can't be with the drivers because the screen flickers when left on bios windows or even when the PC is cold-booting - The worst of it all is that the laptop now behaves this way when I insert the old battery which wasn't the case when I was troubleshooting the issue initially.

Now I'm lost because new battery might not be the solution. How can possibly resolve this issue? Any positive suggestions?

See video for this issue at
https://www.youtube.com/watch?v=D2ZZEcRnkqQ