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Need a new CMOS battery. What kind?

I have a Gigabyte z77x-ud5h (rev. 1). I've contacted Gigabyte, but they've yet to respond. Does anyone know what type of battery I need to buy? I guess I could just open it up and take a look, but I'd like to keep using my computer until I get a new battery.

By the way, I think I need a new battery because my system clock keeps changing upon each reboot. It may not be the battery, though. I recently reinstalled Windows and also setup a dual-boot with Ubuntu. Using EFI and they're both on separate SSDs. Not too familiar with EFI. I set it up right, but I never had this issue with legacy. It may be a problem with GMT and localtime. I tried a registry fix in Windows, but it isn't working.
3 answers Last reply Best Answer
More about cmos battery kind
  1. if the date is changing to 1-1-(some year) then its the battery. if its just the hours off then one of the two os is set to the wrong time zone.
  2. maxwellmelon said:
    if the date is changing to 1-1-(some year) then its the battery. if its just the hours off then one of the two os is set to the wrong time zone.


    Yeah, it's only a few hours off. I'll check Ubuntu's timezone, because Windows is correct. Thanks for the info.
  3. Best answer
    Fixed it. It wasn't the timezone but a difference in Windows set to use universal and Ubuntu using localtime, even though I didn't set it.

    I removed

    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
    "RealTimeIsUniversal"=dword:00000001

    because Ubuntu was set to use localtime in /etc/default/rcS.

    My BIOS clock was off, probably because of the disparity between Windows and Ubuntu using different time methods. So I fixed that. Time seems to be correct in both OSs now.
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