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AlanFlag for New Zealand

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CMOS Battery - Are there any serious implications if it is low on charge

Hi All,

Had a conversation with a customer today, where I noted that the CMOS battery on one of their PCs in the warehouse has a 'low battery' warning on boot up.

It is a Dell and you can press F1 to bypass / acknowledge the warning, and continue to boot up the OS.

I said they should replace the battery or the machine, to which I was asked, 'Why - what are the implications?'

I said that the battery allowed the machine to keep track of time while powered off, to which the customer noted that when the machine boots up it gets it time from time.windows.com or ntp.org or wherever, so why does it matter.  The machine is not domain joined, so any implications from that are not applicable.

I didn't have a reply!

Is there any implication to just leaving the machine as it is other than having to press F1 after it boots (which does mean if it automatically updates, then it won't reboot into the OS, but will get stuck on 'Press F1').

Also, if there are no significant implications, does anyone know if we can change a setting somewhere (BIOS perhaps) to disable that warning?  I did have a look, but nothing jumped out at me.

Thanks,

Alan.
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dbrunton
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Thanks guys - I should have thought about the BIOS settings (although it is most likely that they are all 'factory default' anyway), and I have never (that I know of) seen any of the oddness that you are describing, but I will re-iterate the advice to replace the battery given they are so cheap.

Alan.
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Member_2_406981

ITs better to change. If time wont auto sync and is back to the bios default. SSL in the browser wont work anymore as the certs are invalid for that time. It might go as far as auto updates are not running anymore as update servers cannot be verified.

This is imho, next to the problem that if might not boot, the biggest problem.