pc - not holding time and date correctly

  da vej 19:43 02 Sep 03

If I have not used my pc for a couple of days/weeks it loses track by hours or days.
I went away for a week on the 23/8 and returned on the 30/8 and the clock said 04:30 23/8. I am running xp pro and my mobo is a chaintech apogee 73jl. i dont think it is the battery has it is not afecting anything else like my boot or detection sequence

  wiznyme 19:45 02 Sep 03

It is the CMOS battery

  Jester2K II 19:46 02 Sep 03

Yup battery. Does it loose more time the longer its off?? If so then its the battery. battery doesn't do anything towards "boot or detection sequence".

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