I am replacing the screen and also want to reset the BIOS. From what I've read people seem to think there is NOT such a battery and that the main battery keeps the clock and BIOS settings, but there is something that most definitely looks like a CMOS battery. If this is a CMOS battery, can I reset the BIOS by removing it temporarily? Or does it act as a backup to the main battery keeping the clock and BIOS settings and so on? Edit: I can post a photo if need be.