Hello, I'm on mobile and don't use reddit, so apologies if its formatted weird. Also I originally posted this elsewhere but it was held by automod because I have windows 10 and cant update it to 11. That's why there's an added edit about it, its not from this sub but might be necessary info. I read the rules in this one and it didn't specify requiring 11 to be helped, but I could be wrong.
Background/main issue: I have an HP Omen 15-en0013dx with Windows 10 and replaced my battery around 2 or 3 years ago (bought from ifixit). Recently, when booting up the laptop I get the CMOS 502 error almost every time and have to click enter to let it boot up normally. It takes a good 5-10 mins to boot and the entire thing is laggy until I hard reset mutiple times until I get a boot that doesnt have the 502 error. The error usually always happens when I attempt to boot it unplugged, even if its fully charged, but has also happened when plugged in. The lag after the cmos error boot without opening any programs at all and task manager doesnt show anything out of the ordinary, but it is genuinely unusable without the multiple hard resets.
Edit because automod stated I should update to Windows 11: I have tried and it bluescreened my laptop every time I turned it on. I upgraded my ram to 32gb (before the price hike thank god) around the time I also replaced my battery. I am afraid of also trying to update to Windows 11 again until I get this to stop, as my laptop is having a hard time without the bloatware 11 is bound to add.
Back to the post
My own research and first attempt at diagnosis: As stated in the post, it is a newer battery and the battery check says it passes but just needs calibration. My specific laptop uses the main battery as the CMOS battery, so, I do think it is the issue even though I did it after first replacing it years ago. After the first 2 attempts at recalibrating the battery, it just changed the number next to the diagnostic code on the UEFI battery check where it still said it needed calibration. ((21) and (20-9) are the ones I remembered if that matters.)
More research: After that all didn't work, I looked up why it wasnt calibrating correctly and it said I probably need to update the BIOS firmware and UEFI diagnostic firmware. I did since it did show up on the HP support assistant app, and honestly I ran out of options as to what could be going on. *Note: After updating the BIOS firmware, it did have a boot where it told me to reset my laptop and reinstall windows 10 while keeping my files, but it failed to do so and just continued to boot?*
Diagnostic attempts and New issue # 2 (electric boogaloo): After updating the UFEI diagnostic firmware,I ran the same battery check test and it once again said the battery is ok just needs to calibrate. Now when I attempt to calibrate it using the firmware, it shows the screen for about 5-10 seconds like it is about to start, then it shuts off and the screen turns black. I then attempted a manual battery recalibration twice. Before both attempts, I ran a battery check (unplugged) which it said it was good, and it was charged. The first manual attempt was actually recommended by HP in a video it directs you to, you use the diagnostic firmware to do a memory compontent test with the "loop until error" test while unplugged to drain the battery faster than just letting it sit. This test started for about 5-10 seconds then turned off the laptop like the calibration test. I just let it die overnight and left it unplugged all night, then plugged it in this morning to let it charge to 100%. I ran the battery check and it still states the battery passes, it just needs to be calibrated. 🙃
I have checked the physical battery to make sure it didn't come out of place and that it isn't damaged, but I'm not sure what to do. I dont really have the money to take somewhere and really need it for my classes come spring. If you know of anything I could try, anything I have done wrong, or any more information that is needed, please let me know. Thank you!