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The CMOS battery keeps all the settings like PCI configuration, memory size, drive controllers, USB setup and a host of other stuff. It does a whole lot more than just keep the clock ticking. The CMOS battery is okay.
Maybe try to boot the computer into DOS mode and every now and then issue the TIME/t command. If the time is still messed up, the problem looks to be the RTC on the motherboard.
If the time is okay and does not drift at all, then the OS is messing the clock up, in which case an upgrade might fix it.
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