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Sci.Electronics.Basics -> Soldering onto NiMH batteries?
There are 10 messages in this thread.
You are currently looking at messages 1 to 10.
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Author: DeanBDate: 09:48 19-06-08
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Hello all,
I've only done a little soldering before, but I want to rebuild a
battery pack for my TI-59 calculator (which is basically 3 AA-sized
batteries soldered together in series).
Can I just solder directly onto the battery terminals? With a copper
wire. Should I use flux? Will this overheat the battery and/or blow it
up?
Thanks for any tips!
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Author: Tim WescottDate: 09:53 19-06-08
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DeanB wrote:
> Hello all,
>
> I've only done a little soldering before, but I want to rebuild a
> battery pack for my TI-59 calculator (which is basically 3 AA-sized
> batteries soldered together in series).
>
> Can I just solder directly onto the battery terminals? With a copper
> wire. Should I use flux? Will this overheat the battery and/or blow it
> up?
>
Battery tabs are spot welded because soldering will overheat the seal,
and possibly damage the battery.
Do a web search on "solder NiCd" or "solder Nicad", and you'll get
lots
of opinions on how viable an approach it is and how to do it.
You can get batteries from DigiKey with tabs spot-welded on, then you
can solder the tabs together for your application. You'll dump a lot
less heat into the battery in the process, particularly if you use a
good hot iron that lets you make a good joint quickly.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
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Author: jfeng@my-deja.comDate: 13:28 19-06-08
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On Jun 19, 6:48=A0am, DeanB <deanbrow...@yahoo.com> wrote:
> Hello all,
>
> I've only done a little soldering before, but I want to rebuild a
> battery pack for my TI-59 calculator (which is basically 3 AA-sized
> batteries soldered together in series).
>
> Can I just solder directly onto the battery terminals? With a copper
> wire. Should I use flux? Will this overheat the battery and/or blow it
> up?
>
> Thanks for any tips!
How did you open the battery pack without damaging it?
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Author: Phil AllisonDate: 20:53 19-06-08
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"DeanB"
>
> I've only done a little soldering before, but I want to rebuild a
> battery pack for my TI-59 calculator (which is basically 3 AA-sized
> batteries soldered together in series).
>
> Can I just solder directly onto the battery terminals?
** With decent soldering iron and some care - yes.
> With a copper wire.
** Solid or stranded or tin plated - take your pick.
>Should I use flux?
** What is found inside normal flux-cored solder is fine.
> Will this overheat the battery and/or blow it up?
** No - not unless you take an inordinate amount of time to make the
joint.
Warnings against soldering direct NiCd or NiMH cells are not founded on
fact.
Manufacturers use steel tabs & spot welding as it is a much quicker method
in mass production - but makes an inferior joint ( more resistance) than one
made with short, solid copper wires and solder.
..... Phil
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Author: DeanBDate: 09:23 20-06-08
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On Jun 19, 1:28=A0pm, "jf...@my-deja.com" <jf...@my-deja.com> wrote:
> On Jun 19, 6:48=A0am, DeanB <deanbrow...@yahoo.com> wrote:
>
> > Hello all,
>
> > I've only done a little soldering before, but I want to rebuild a
> > battery pack for my TI-59 calculator (which is basically 3 AA-sized
> > batteries soldered together in series).
>
> > Can I just solder directly onto the battery terminals? With a copper
> > wire. Should I use flux? Will this overheat the battery and/or blow it
> > up?
>
> > Thanks for any tips!
>
> How did you open the battery pack without damaging it?
I had to snap off a cross-piece to get the battery out, but that does
not seem to be an important piece of the construction. I can run the
thing off a recharger ok without the cross pieces.
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Author: C. Nick KruzerDate: 22:49 21-06-08
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Hi DeanB, you wrote:
>I've only done a little soldering before, but I
>want to rebuild a battery pack for my TI-59
>calculator (which is basically 3 AA-sized
>batteries soldered together in series).
>Can I just solder directly onto the battery
>terminals? With a copper wire. Should I use
>flux? Will this overheat the battery and/or blow
>it up?
I have opened up surplus NiMH batteries and removed the cells to
rearrange them as a battery supply for a different device. I was able to
solder them and my new battery pack worked. I didn't have any explosions
when soldering but the pack started to leak after about 12 months of use
with regular recharging.
I threw the battery pack away when it started leaking. I don't know for
sure if the resoldering of the cells caused the leaking. The original
cells might have been a problem without the tampering. They were sold as
surplus.
I consider the effort and cost to be worth it. Less than two dollars of
surplus batteries made a working, rechargable pack that would have cost
me nearly sixty dollars!
insula
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Author: Bob MonsenDate: 16:41 22-06-08
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"C. Nick Kruzer" <insula@webtv.net> wrote in message
news:8194-485DBDB6-225@storefull-3257.bay.webtv.net...
> Hi DeanB, you wrote:
>
>>I've only done a little soldering before, but I
>>want to rebuild a battery pack for my TI-59
>>calculator (which is basically 3 AA-sized
>>batteries soldered together in series).
>>Can I just solder directly onto the battery
>>terminals? With a copper wire. Should I use
>>flux? Will this overheat the battery and/or blow
>>it up?
>
> I have opened up surplus NiMH batteries and removed the cells to
> rearrange them as a battery supply for a different device. I was able to
> solder them and my new battery pack worked. I didn't have any explosions
> when soldering but the pack started to leak after about 12 months of use
> with regular recharging.
> I threw the battery pack away when it started leaking. I don't know for
> sure if the resoldering of the cells caused the leaking. The original
> cells might have been a problem without the tampering. They were sold as
> surplus.
>
> I consider the effort and cost to be worth it. Less than two dollars of
> surplus batteries made a working, rechargable pack that would have cost
> me nearly sixty dollars!
>
> insula
>
Here is a tip. If you are soldering onto battery terminals, first melt a big
blob of solder onto the end using a very hot iron. Then, remelt the solder
and stick the wire into it. Works quite nicely, and doesn't overheat the
battery too much.
This works well for sets with tabs welded onto them too. Connecting between
welded sets is much easier with 'the blob' technique.
Spot welding is obviously better, but I don't have a spot welder...
I agree about RC pack pricing, way too much for what you get.
Another tip is that you can get shrink-wrap tubes to fit the battery pack
into, which make them very nice looking, and holds them together well, so
there isn't as much stress on the solder joints.
Regards,
Bob Monsen
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Author: Kris KriegerDate: 11:16 23-06-08
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DeanB <deanbrown3d@yahoo.com> wrote in news:e2252413-5233-4454-bce5-
9abaf89c7e2f@e39g2000hsf.googlegroups.com:
> Hello all,
>
> I've only done a little soldering before, but I want to rebuild a
> battery pack for my TI-59 calculator (which is basically 3 AA-sized
> batteries soldered together in series).
>
> Can I just solder directly onto the battery terminals? With a copper
> wire. Should I use flux? Will this overheat the battery and/or blow it
> up?
>
> Thanks for any tips!
I'm a beginner, so sorry if this is a really basic question, but, what is
the advantage of soldering them in, rather than using a battery holder?
Thanks!
- Kris
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Author: BobWDate: 13:32 23-06-08
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"Kris Krieger" <me@dowmuff.in> wrote in message
news:bNednQiMUNLxI8LVnZ2dnUVZ_gednZ2d@earthlink.com...
> DeanB <deanbrown3d@yahoo.com> wrote in news:e2252413-5233-4454-bce5-
> 9abaf89c7e2f@e39g2000hsf.googlegroups.com:
>
>> Hello all,
>>
>> I've only done a little soldering before, but I want to rebuild a
>> battery pack for my TI-59 calculator (which is basically 3 AA-sized
>> batteries soldered together in series).
>>
>> Can I just solder directly onto the battery terminals? With a copper
>> wire. Should I use flux? Will this overheat the battery and/or blow it
>> up?
>>
>> Thanks for any tips!
>
> I'm a beginner, so sorry if this is a really basic question, but, what is
> the advantage of soldering them in, rather than using a battery holder?
>
> Thanks!
>
> - Kris
The physical mounting may not lend itself to any available holder, and the
mechanical vibrations may disallow it, too (like in a model car or
airplane).
Additionally, I don't think you could achieve the low battery-to-battery
connection resistance that is required for high current applications without
using either soldering or welding techniques.
Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==
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Author: Kris KriegerDate: 14:01 23-06-08
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"BobW" <nimby_NEEDSPAM@roadrunner.com> wrote in
news:ZtOdnZ3zEbGLQ8LVnZ2dnUVZWhednZ2d@giganews.com:
>
> "Kris Krieger" <me@dowmuff.in> wrote in message
> news:bNednQiMUNLxI8LVnZ2dnUVZ_gednZ2d@earthlink.com...
>> DeanB <deanbrown3d@yahoo.com> wrote in news:e2252413-5233-4454-bce5-
>> 9abaf89c7e2f@e39g2000hsf.googlegroups.com:
>>
>>> Hello all,
>>>
>>> I've only done a little soldering before, but I want to rebuild a
>>> battery pack for my TI-59 calculator (which is basically 3 AA-sized
>>> batteries soldered together in series).
>>>
>>> Can I just solder directly onto the battery terminals? With a copper
>>> wire. Should I use flux? Will this overheat the battery and/or blow
>>> it up?
>>>
>>> Thanks for any tips!
>>
>> I'm a beginner, so sorry if this is a really basic question, but,
>> what is the advantage of soldering them in, rather than using a
>> battery holder?
>>
>> Thanks!
>>
>> - Kris
>
> The physical mounting may not lend itself to any available holder, and
> the mechanical vibrations may disallow it, too (like in a model car or
> airplane).
>
> Additionally, I don't think you could achieve the low
> battery-to-battery connection resistance that is required for high
> current applications without using either soldering or welding
> techniques.
>
> Bob
Oh, OK, thanks!
- Kris
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