(depending on age of this relic)
A couple of pins to short, to zero the CMOS "officially", intended for use before initial fire-up of the board. Then usually - you use same shorting block to reconnect to the (new) battery. Mostly - I think these are labelled, near battery carrier and silk-screened "short" or such-like.
I've never experimented to confirm, as alleged -- that this step is necessary, so that next boot with battery renewed - properly loads BIOS defaults. But it can't hoit.
Ashton
(I used to pull most old-style CMOS Varta-like batts and install appropriate AA-cell carriers. EZ, cheap, only need do it once) But if yours is That old -