c-mos battery

How can you tell if your battery is running down apart from the computer clock losing time every day?
21:28 Fri 23rd Feb 2007
 
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Thats how you know unless you remove it and test it with a multimeter- life is 5-7 years and they cost about �1.00 & 2 minutes to fit
Question Author
I realise that the clock is one of the first indications of the battery running out but it is not as simple as you make it sound. I have been looking into it and have found that as soon as you change your battery, your computer is wiped so you lose everything. That is why I want to make sure that it is the battery and not anything else. It doesn't lose time overnight, only when it is on during the day - which doesn't make sense. Also my computer is only just two years old.
I chyanged my battery a week ago - it did not wipe the computer - mine is two yrs old.

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