battery desoldering advice

[Scott Stevens]

On Sat, 9 Apr 2005 00:25:22 -0500
"Randy McLaughlin" <cctalk at randy482.com> wrote:

> From: "C Fernandez" <fernande at internet1.net>
> Sent: Saturday, April 09, 2005 12:05 AM
> > Jay,
> >
> > If your quick about it, soldering shouldn't hurt a battery.  I've
> > kept a wet cloth handy while doing it, so I can keep the battery
> > cool.  We've actually been talking about replacing nvram batteries
> > in another thread.... those all get soldered.
> >
> > Chad Fernandez
> > Michigan, USA
> >
> > Jay West wrote:
> >
> >> I need to replace the battery in an item I have. It's the 
> >> quartersized/style one. The way it is attached to the board, is via
> >a > clip arrangement that you'd swear makes the battery removable.
> >However, > it is in fact soldered or spot welded into the clip
> >somehow. As a result, > I'd rather not just cut the clip arms to
> >replace the battery as I'd have > trouble getting the new one in.
> >>
> >> The only possibility I see is unsoldering the clip from the
> >battery, but > it strikes me as a rather bad idea to put a soldering
> >iron to a battery. > Suggestions?
> >>
> >> Jay West
> 
> I'm no expert but I've soldered directly onto batteries for years and
> never had any problems.
> 
> I use a soldering station and run it up to 850 degrees (F).
> 
> I start by tinning the battery then using my finger rub spit on it to
> cool it, people afraid to be crude can use a damp sponge.
> 
> After I've tinned all of the battery ends I then can quickly tack
> wires onto them running the soldering station at arount 750 degrees
> (F).
> 
> I run the temperature up high to reduce time spent applying heat to
> the battery.
> 
> 

I used to have some success using special silver solder.  It wets much
better to the batteries.  It is intended for non-electric use, though,
so the flux is very aggressive and must be cleaned completely off.

But soldering to sealed batteries, especially lithium batteries, isn't
that good an idea.  It's better to locate a connector for them.  There
are connectors available for most coin-type batteries.

> Randy
> www.s100-manuals.com 
> 
>