nope.. dont play with the settings since you have an internet connection why dont you research more on the MOBO, and you should have a manual since hindi nmn OEM yan.
on the battery part, from what i have known, palit ka lang ng CMOS battery kapag nakapag SAVE ka pero still no changes happen kapag nag reboot na. nawawala na yung supply ng power.
hmm.. please correct me if im wrong.
thanks!