CMOS Checksum invalid 502(HP omen 15)

[Hiddennn]

Hello everyone, recently (oct-early nov 2021) I found out that my laptop's mousepad was swollen, and I remember that the first time I've replaced my battery with warranty (December 2020). The technician told me before that my laptop's battery is under my mousepad and it will affect the function of my mousepad. So, I directly thought of it is my battery that is severely swollen until it is visible from the mousepad. I've called the hp support/assistant and asked about the replacement of a battery. After their quotation, I found out it is quite expensive for me to afford. So, I tried to search online and bought a replacement battery. While waiting for the battery, I removed my swollen battery from the laptop and start working with plugging in the laptop (without battery) and get the CMOS checksum invalid every time I start my laptop. After doing some research on the Internet, I found out that it is my battery problem. So, I'm not so concern about it and continue to wait for my battery to arrive so I can replace it.

When I replaced my battery, my laptop is working well without any error. Around about 2 days, while I'm shutting down my laptop ( still loading to shut down laptop), I turned off my power plug, and my laptop suddenly pop off just like PC without power. I tried to turn my laptop back on (without plugged in ). It does require me to press the power button for a few times and it does show the CMOS checksum Invalid/CMOS Reset (502) issue. After I turned on the laptop, it does reset my BIOS setting such as Virtualization setting. The time and date does reset to 2018 when I enter the BIOS setting, but it back to normal (2021) when I enter windows. (might because of auto date/time when I'm connected to the Internet)

At first, I'm not very concern about this problem, this is because the next few days the laptop is working very well and I've tried a few times turning off the power plug without shutdown the laptop. It doesn't appear any problem like that again. Every time I can turn on my laptop smoothly. Then, I encounter the same problem again after maybe 2/3 days. At first, I thought I did not insert the battery properly, so I tried to re-insert the battery carefully. Then, the laptop continues to work well for around 1 week and now I'm encountering the same issue again.

Is there any solution for this issue? I've search on the Internet about this issue and not really found some problem similar to mine. And if I'm not wrong, my HP Omen 15 does not have a CMOS battery and the BIOS should be controlled by my battery. I'm doubt that the battery I bought is having problem but it does work well for few days/some time and it doesn't have any issue about the BIOS.

I'm not sure about what is the main problem to cause the problem to happen after working well for some time, at first I thought it was because of I plugged in the laptop for too long, so I tried to turn off the power plug more frequently when the laptop is at full battery. But the problem still happens now.

I just updated to windows 11 recently, the problem occurs when I'm in windows 10. So it definitely not the windows problem.

Thank you very much.

[Echo_Lake]

@Hiddennn

Thank you for posting on HP Support Community.

Don't worry as I'll be glad to help,  
I understand you are getting this error on the computer screen and I appreciate your efforts to try and resolve the issue. The last thing I can suggest try restoring the BIOS.  

1. Press enter to restart the PC. (do not skip any troubleshooting steps, even if you feel steps are repeating)

2. If the error displays after restarting, try to restore the BIOS using a USB drive. For more information, see the "Recover the BIOS using a USB recovery drive" section of the following:For notebook computers, go to HP Notebook PCs - Recovering the BIOS (Basic Input Output System).

3. If restoring the BIOS fails, please reach out to the HP Technical Support team in your region regarding the service options for your Notebook. You may create a case on the website to obtain a case number if required. Kindly watch this video to know how.

Keep me posted for any other assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!
 

Have a great day!