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From: Petrus Tax on 17 Feb 2010 16:29
Hello,

a simple question: Above which voltage does this 3 volt cmos battery still
properly function?
Many thanks in advance.

Petrus


From: Paul on 17 Feb 2010 18:10
Petrus Tax wrote:
> Hello,
>
> a simple question: Above which voltage does this 3 volt cmos battery still
> properly function?
> Many thanks in advance.
>
> Petrus
>

Somewhere around 2.3 to 2.4V.

2.0V for the chipset, plus some voltage for the diode used to protect the battery.

Battery --- diode --- Southbridge (CMOS memory and RTC)

The thing is, if the battery is getting that low, in another month it'll be
completely flat. The batteries I get here, last about three years, if the
computer is unplugged the whole time (computer in storage).

Paul
From: John McGaw on 17 Feb 2010 18:26
On 2/17/2010 4:29 PM, Petrus Tax wrote:
> Hello,
>
> a simple question: Above which voltage does this 3 volt cmos battery still
> properly function?
> Many thanks in advance.
>
> Petrus
>
>

It doesn't pay to second guess when something critical is going to fail.
Replacing the battery is dirt cheap and takes almost no time. A while ago I
ordered 25 of these batteries from amazon.com. Total price was under $6.
Since so many pieces of equipment use them there should be no waste and in
the refrigerator they should last for years and years.
From: philo on 17 Feb 2010 19:06
Petrus Tax wrote:
> Hello,
>
> a simple question: Above which voltage does this 3 volt cmos battery still
> properly function?
> Many thanks in advance.
>
> Petrus
>
>


I've seen mobos act funny when the cmos battery gets down to about 2.5v

If it's under 3 volts...replace it...they cost all of $2 or so
From: Petrus Tax on 18 Feb 2010 09:52

"philo" <philo(a)privacy.invalid> wrote in message
news:hli0aq$bph$1(a)news.eternal-september.org...
> Petrus Tax wrote:
>> Hello,
>>
>> a simple question: Above which voltage does this 3 volt cmos battery
>> still properly function?
>> Many thanks in advance.
>>
>> Petrus
>
>
> I've seen mobos act funny when the cmos battery gets down to about 2.5v
>
> If it's under 3 volts...replace it...they cost all of $2 or so

Thank you for all the information. I was asking this question because I had
ordered a batch of new "coins", but the voltage of one of them was rather
low so that the replacement didn't work properly. One bad apple ...

Petrus


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