I just purchased a new NUC8I5BEH and usually when I turn it off I also disconnect it from the power source. Everytime I turn in back on I see a "Cmos checksum error" and the warning message that time and date are not set during the boot up screen. In the bios setting I can see the date/time are indeed resetted every time.
What can be the problem, maybe a bad cmos battery?
I tried to reset the bios setting to default and also updated the bios to the latest but the errors are still there. If I leave the power source connected nothing strange happen and the unit work as intended.
Also I can't see the cmos battery from the side grills, maybe is enterely missing?
I don't feel confident to remove the motherboard from a new unit. If I keep it like this can I have some issue in the long term?
Thanks for the reply!
Eventually I removed the motherboard and found out that the BIOS battery was entirely missing!
Added one taken from an old laptop and now everything is working fine.