On Fri, 28 Jan 2000 09:01:04 +0000, "Edenyard" <[EMAIL PROTECTED]> wrote:
> Dear Mark,
> You wrote recently about troubles with your CMOS battery and that it
> only measured 3.6V when you thought that it should have been 6V.
> Proceed with caution here. There are some that run on 3.6V
> batteries and also some that run on 3V. Is your battery marked 6V? Does
> it have a part number?
> Often, people replace a failed expensive lithium CMOS battery with a
> string of 'AA' cells in a normal plastic multiple 'AA'-style holder. All
> you have to do is to decide how many you need: 2, 3 or 4. In that way,
> you don't end up paying through the nose to keep the CMOS alive. Since
> CMOS technology only draws nanoamps when in standby, 'AA' cells will
> work nicely. Usually, 'AA' cells in this sort of application fail
> due to old age before their energy has been drained.
> If you can report a battery part number, we may be able to decipher
> the proper voltage for you.
> Hope this helps!
> Ron.
Agree Mark,
normal terminal volts on a single lithium cell would be about 3.4v to 3.6v
no matter what age it is until it actually dies. Unfortunately, three nicads,
will produce the same volts (1.2v each = 3.6v) if stacked three in series.
Both Lithium and Nicads have a "reverse" bathtub curve on the volts
versus lifetime graph, and retain terminal volts until the very end of
the useful life. In the case of Lithium this is about ten
years or so in a standby application such as holding up bios or memory
info.
For Nicads, it is anything from weeks to months, so there is probably
NOT a nicad pack in your 'puter. If you can be methodical enough to note
when you fit it, and check each 6 months or so, you could probably fit a
pack made up using ordianry (good quality) alkaline cells, AA size,
these have a lifetime shelf of about 3 years, but if Glenn's comment
that a P150 lithium is $3.00 US, then probably the alkalines would be
dearer!
reverse bathtub curve= ________________________
\
\
|
|
|
|____ dead!
Regards
Mel
Arachne, the Internet Suite and Browser for DOS, supports tables,
graphics, animations, forms, HTML 4.0 Transitional Pages and more.
Visit Mel's UK Arachne Pages for details and FREE Download.
Kick-start a 386/486, or use on a Pentium for superb browsing!
http://www.arachne4dos.freeserve.co.uk
e-mail to: [EMAIL PROTECTED]
or: [EMAIL PROTECTED]
http://www.bccscotland.freeserve.co.uk
Web Pages of |British Caravanners Club, Scotland|
http://www.euramcom.freeserve.co.uk
Mel's Ham Radio Equivalents Pages
http://www.webtheon.freeserve.co.uk
Webtheon Internet Design
