i have a P4c800 MB and when my computer is off the clock does not work so the day never advances. Could this be my battery? I checked the voltage and got 3.1 as a reading. Then I checked another computer that works fine and I get 2.9 Volts on the lithium battery. I put the battery back but still have the clock problem. What should the voltage be of this battery and is this the problem? This is a new board which was installed and working fine. Could this cause windows XPpro to freeze during an installation??