I set the time it keeps track and all that but then the computer goes off and back on 20 minutes later and the times 20 minutes slow. Would this be a dead battery? its just on a 133 that I'm using as a file server and indeed to keep it on all the time but if the battery dies will I lose my bios settings? Also are these just standard watch batterys? IT would be nice to have a systems clock thats not wrong