Strange issue with laptop.

Kaleen Bhaiya

Innovator
So this problem began a month ago. I am using HP Pavilion AU-134TX. I was casually using my laptop for some purpose and I received a Cumulative update from Windows(on W10). After installing it, my laptop started behaving weird when on battery. It would start stuttering when the battery1 reached around 50%. Everything was working fine prior to update, just the battery used to give up pretty early. I was told that battery backup would be less as it is a compatible one so I knew this would be the case.

Since the BB was very less and that I had another spare compatible battery, I installed it. I even did a fresh installation of Windows 10 22H2 just to clear the nothing from the OS side is causing issue. But the battery wouldn't charge above 82% while the battery light showed white colour, meaning the system detected it was charged 100%. I did another installation with older version, 21H1 as well, yet the issue persisted.
So I did a fresh installation of Windows 11 24H2 and the battery charging increased from 82 to 90%. But that's it. Then I did another fresh install of W11 23H2 and the battery finally started capping at 99% with white light, better than 82%. I though this would be calibration issue but I couldn't calibrate it even when kept for 8+ hours as the charge capacity won't go beyond 87% on all previous versions except this current W11 23H2.

Now the problem is, if I have to use the battery, the whole experience is so choppy and it stutters like crazy. It takes 2-3 minutes to scroll on YT Firefox or any browser for than matter(I was assuming Google trying to screw around with add blockers, but YT did the same with all browsers- Chrome, Edge with no add-ons whatsoever. Keeping YT aside, my laptop barely becomes usable if I have to use the battery, but runs smoothly on AC power.

I believe, I have discarded all the OS and software aspects causing issues, so that leaves the hardware part. I discussed this with one of my friend, he's stating that there could be an issue with the Power IC. But I need your opinion as to what could be the issue. I am not looking to buy a new laptop right now because ARM is still in nascent stage and I can easily pull this 16gig model even though MS might think otherwise, as W11, 23H2 runs buttery smooth.

I am sorry for the long post, but I wanted to elaborate as much as possible so that you would have an understanding of the issue. I have used the drivers from HP site just so that they don't cause issue, but it doesn't seem to be causing any issue, in case anyone thinking. Mine is an incompatible hardware. It has 7th gen 7200U with Secure boot and TPM enabled.
 
Change power plan from balanced to High Performance from control panel
Then edit High Performance power plan,
Here under Processor power management / Maximum processor state, choose 100% On battery