CMOS Battery location

Solution
2QUYybI.jpg


Looks to be right there, below the PCIe x16 slot.
Your user manuals don't actually show this at all but...cmos is pretty recognizable and unmistakable. It's a flat battery about size of a dime lying on the board. Should look something like:
https://computing.which.co.uk/hc/en-gb/article_attachments/204321729/CMOS_battery.png
Just open up the side of your computer (after you've shut it down), and make sure you do not touch your mobo with your hands, without touching them to a grounded metal surface first (like metal parts of your computer case).
 


I have done that. On this model, the cmos is not recognizable, as if it is hiding somewhere