Does the 14-df0023cl laptop have a separate battery for CMOS?

[sour-dough]

I could not find a CR2032 battery after opening. 

[Paul_Tikkanen · Accepted solution]

Chapters 3 & 5 of the service manual indicates it does not have a CMOS/RTC battery.

HP 14 Laptop PC Maintenance and Service GuideIMPORTANT! This document is intended for HP authorized ...

No CMOS/RTC battery part number, no CMOS/RTC battery removal and replacement procedure.

The main battery also serves as the CMOS/RTC battery to maintain the BIOS and system clock settings.

[sour-dough]

However, when the main battery goes dead, I end up with this error after charging and turning power on:

• The CMOS checksum is invalid. The CMOS will be reset to the default …
• Setup options to see if they change
• CMOS Reset (502)

With a small amount of effort, I am able to boot and the error will not occur again unless the battery dies again. I thought the CMOS data/checksum would be non-volatile.  

[Paul_Tikkanen]

I guess other than replacing the battery, your only option would be not to let the battery go completely dead.

My notebooks that don't have CMOS batteries have enough juice left in them for a month.

I only got that problem once like you are having,

One notebook's battery completely drained and I got that 502 error.

Charging the battery up and never letting it get to the point where I couldn't turn on the notebook without plugging in the charger resolved the problem.

I always disable the fast startup option in the windows control panel>power settings which slows down the battery from draining.

With fast startup enabled, more battery power is needed because when you tell the notebook to shut down, it is more like a hibernation state than a complete shutdown.

But if your battery needs to be replaced and the battery can't hold a charge until you plug the notebook in again, you are going to get that CMOS problem over and over again, unless you keep the notebook plugged in all the time--and that's not a good idea either.