Clock stopping when computer is off

PawloA
PawloA used Ask the Experts™
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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??
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Commented:
Hi PawloA,

I've seen this on some laptop motherboards, but I expect that it could happen on desktop models as well.

To fix it I unplugged the power cord.
Removed the BIOS battery (the button battery on the motherboard)
Wait a while (15 minutes)
Install the battery
reconnect power cable
boot, but intercept to the bios config utility
find and run a bios reset (on some motherboards this is a jumper proceedure and not a bios screen proceedure)

Hope this helps,
Alan
Top Expert 2012

Commented:
The CMOS battery should be 3v, and a faulty battery can sometimes mess up the clock circuit.  Even though it was a new board, the board may have been sitting on a shelf for along time.  The batteries are cheap to replace and last a long time.
Commented:
Since battery is reading 3.1V, it should be good.  3.0V or greater indicates a good battery.

Given the low cost, certainly wouldn't hurt to change battery.  Also check and ensure battery is seated tightly, is making good contact, and there are no broken parts in battery holder.

Real time clock is probably OK if time is accurate on AC power.

Commented:
I believe it is the mobo I would replace it (, but this would be a last resort). Have you tried resetting the bios as Alan suggested?

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