[Nottingham] CMOS Checksum error

Jim Moore jmthelostpacket at googlemail.com
Thu Oct 2 12:15:41 UTC 2008

Hi, Ron:

It's your battery. Doesn't matter that you only replaced it in May, some 
motherboards drain the CMOS battery very rapidly; this is a particular 
problem if you switch your system off at the wall. Lithium coin cells 
also have a comparatively short shelf life (a few years as opposed to a 
decade for zinc-carbon or alkaline batteries), so if you used old stock 
(you'll likely never know unless you got the cell in a retail package in 
which case the use by date would be on the pack), then you'll see a  
need for replacement much sooner.



Ron Wilton wrote:
> Hello
> When I boot up I get the following message:-
> CMOS checksum error - Defaults loaded.
> What's causing this? And what can I do to prevent it? I would have 
> thought that it shouldn't be anything to do with the battery as I only 
> changed this in May.
> Thanks
> Ron
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