I'm replacing a small button battery (CR 2032) with two AAA batteries, I'm
intending to leave the old discharged button battery in its place and solder
the leads from the AAA batteries directly on to the button battery.
Is the heat that I would need to apply to the button battery with the
soldering iron to solder to it, likely to make the battery prone to
'leakage' in the future? Or perhaps cause it to go bang at the time of
soldering? Thanks for advice.
I think you'll find that the discharged button cell will suck the new AAA's
Also, the CR2032 is 3.6V. Three AAA's are 4.8V. I wonder what the voltage
jump would do to your equipment.
Properly applied, the heat should do no damage. Some motherboard batteries
used to be directly soldered-in.
A better approach, if you want a hard-wired battery receptacle, would be to
unsolder the CR2032's battery-holder from the PCB, then solder the leads of
your newly-purchased AAA battery-holder to the CR's holes PCB.
Correction: The button batteries had flat leads WELDED onto them which
were then soldered to the motherboard. It's really kind of difficult
to solder effectively to stainless steel. Direct connections to
batteries are spot welded.
Best approach is to replace the button cell. It'll most likely
have the same or longer life anyway as it is pretty much just the
shelf life that matters.
Those batteries typically last 5 years. 5 years from now the
motherboard is going to be so obsolete, that once more replacement is all
it might ever possibly need.
On Tue, 24 Aug 2010 07:12:30 -0700, jamesgangnc wrote:
And obsolescence is one of those very vague things; we have no way of
knowing if the thing will be of no use to the OP in five years, and if it
is then maybe it does make sense to fit a battery holder.
On Tue, 24 Aug 2010 16:07:06 +0000 (UTC), Jules Richardson
Still run a pentium 2 from 1997? That's just two batteries ago.
Also: current draw is so low that it is self discharging that is the
primary concern. A AA battery isn't going to last any more than the button
On Tue, 24 Aug 2010 11:48:18 -0500, AZ Nomad wrote:
That's probably about the age of one of the firewall systems - it doesn't
need to be any faster (I think it's an AMD K6) for the job that it does,
and it's in a nice shoebox-sized case so can sit neatly on the shelf. My
main data-recovery system's a few years older than that, kept because it
does what I need (where modern systems wouldn't) and I have a few spares
My oldest machines are over 30 years old now, but as they don't even have
any kind of battery they're probably not relevant :-)
As salty says, I think AAs would be worse (and AAAs worse still), but
maybe for the OP it's a convenience thing (I can never find one of those
2032's kicking around when I need it. Not sure sure about AAAs though, I
don't think I have a single thing that takes 'em)
On Tue, 24 Aug 2010 19:01:54 +0000 (UTC), Jules Richardson
AAA batteries are almost unheard of in Europe and Africa - but for
some reason pretty common here in Canada.
We used to install AA battery cases for CMOS batteries way back when -
the standard CMOS battery then being a "custom" battery and quite
pricy. They were 6.6 or 6 volt, and the size of a 9v battery.
Yes, those too. But MOST motherboards had a "battery header" that
allowed you to install an external battery. We even had a rechargeable
CMOS battery kit available that charged from a floppy drive connector.
I've had flashlights/torches that use AAAA cells. They're kind of cute.
I have some LED lights that use two lithium cells that are smaller than
the AAAA,s and they have a little pin sticking out one end.
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