Not a difficult item to replace, and it looks very accessible and obvious on that board.
It will be (99.9%) a CR2032 as in the above link. It may need levering slightly to remove it - I tend to use something non-conductive like a cocktail stick.
If you go for it, ground yourself beforehand by touching the case for a few seconds. (and patently, the machine should be off and unplugged)
Be aware that you will lose BIOS settings if/when the battery is removed.
On first subsequent startup, you will need to set date and time again, and I suggest you go through the "load optimised defaults" path to get things back working.
BIOS is entered by pressing "DEL" repeatedly during startup, (it may just enter it anyway after battery replacement) and neither of the above should require any deep knowledge - The manual doesn't describe setting date and time, but my guess is that it is done by clicking on the "settings wheel" next to the date/time display on the prime BIOS screen - take care with date (it may not be DD/MM/YY format in BIOS, and 12/24hr clock). After you've set that, you can elect to load optimised defaults as you exit (menu item).
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