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#3115240 - 09/04/13 09:53 PM soldering on nimh battery
spasm3 Offline


Registered: 05/30/10
Posts: 6524
Loc: out there
My wife has this facial scrubber that won't charge anymore, i tore it apart and found 2 nimh aa batteries soldered onto the circuit board tabs with a solder strip on the bottom making them in series. I don't know if its safe to solder on replacement nimh batteries. I would never try it on a lithium ion battery. Should I ?
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#3115241 - 09/04/13 09:55 PM Re: soldering on nimh battery [Re: spasm3]
JHZR2 Offline



Registered: 12/14/02
Posts: 38486
Loc: New Jersey
All batteries will have degradation due to chemistry changes under heat. There is not a volatile organic electrolyte that will break down at low temperatures as in Li-ion. I would do it but be very cognizant still of how much heat youre putting in - it flows axially very fast as it is in the plane of the current collector.

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#3115245 - 09/04/13 09:57 PM Re: soldering on nimh battery [Re: spasm3]
spasm3 Offline


Registered: 05/30/10
Posts: 6524
Loc: out there
Thanks !!
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#3115276 - 09/04/13 10:31 PM Re: soldering on nimh battery [Re: spasm3]
Michael_P Offline


Registered: 08/20/07
Posts: 1620
Loc: .
Check out cordless phone batteries. I have retrofitted them for many non phone applications.

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#3115282 - 09/04/13 10:41 PM Re: soldering on nimh battery [Re: spasm3]
bvance554 Offline


Registered: 09/24/12
Posts: 1917
Loc: VA
Yes you can solder Nimh batteries with no worries.

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#3115290 - 09/04/13 10:49 PM Re: soldering on nimh battery [Re: spasm3]
JimPghPA Online   content


Registered: 08/22/09
Posts: 3219
Loc: Pittsburgh,PA U.S.A.
It might be a good idea to be sure there is no oily surfaces by wiping it with some alcohol, and then rough up the surfaces on the batteries with many scratches. Scratches make soldering to a new battery much easier and you will not have to keep the heat on the battery as long as it would take if the surfaces were not scratched.
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#3115312 - 09/04/13 11:28 PM Re: soldering on nimh battery [Re: spasm3]
Quest Offline


Registered: 12/19/04
Posts: 7355
Loc: beaver land EH?
sand paper and solder flux are your friends.

Q.
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#3115330 - 09/05/13 12:11 AM Re: soldering on nimh battery [Re: spasm3]
mattwithcats Offline


Registered: 06/13/13
Posts: 1358
Loc: Virginia


Edited by mattwithcats (09/05/13 12:16 AM)
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#3115339 - 09/05/13 12:54 AM Re: soldering on nimh battery [Re: spasm3]
Andy636 Offline


Registered: 12/30/10
Posts: 704
Loc: Romania
Perfectly safe to do. I used to build my own batteries packs for RC boats and planes use 8-12 NiMH cells and never had a problem but whatever you do stay away from Li batteries smile

Best way to do it is with an arc welder but flux welding works as well.

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#3115454 - 09/05/13 07:08 AM Re: soldering on nimh battery [Re: spasm3]
NateDN10 Offline


Registered: 01/10/10
Posts: 1638
Loc: Rochester, NY
I have done it before... just do it quickly! Solder flux is a good idea.
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#3115843 - 09/05/13 02:24 PM Re: soldering on nimh battery [Re: spasm3]
Vikas Offline


Registered: 07/22/05
Posts: 10603
Loc: NorthEast
I had never heard the wife's instrument being refereed as "facial scrubber" though :-)


Edited by Vikas (09/05/13 02:25 PM)

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#3115995 - 09/05/13 05:53 PM Re: soldering on nimh battery [Re: spasm3]
Papa Bear Offline


Registered: 08/11/05
Posts: 6512
Loc: Leamington, ON, Canada ..... r...
Clean & flux the area. Get the iron HOT. Get in and get out. You'll be fine.
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#3116897 - 09/06/13 03:55 PM Re: soldering on nimh battery [Re: spasm3]
JimPghPA Online   content


Registered: 08/22/09
Posts: 3219
Loc: Pittsburgh,PA U.S.A.
If you have not bought the batteries yet, mattwithcats is correct about getting cells with the solder tabs already on them.

Also, look for a "Batteries Plus" store in your area, they can sell you the cells with tabs or even make a pack for you. They usually have a spot welder that will make the small spot welds on metal straps and build the entire pack for you.

BTW, one of the things to keep in mind is that if you have bare wire or uninsulated metal straps as the connections between the cells, be sure they can not touch the outer part of the cells.
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#3117187 - 09/06/13 09:31 PM Re: soldering on nimh battery [Re: JimPghPA]
spasm3 Offline


Registered: 05/30/10
Posts: 6524
Loc: out there
Originally Posted By: JimPghPA
If you have not bought the batteries yet, mattwithcats is correct about getting cells with the solder tabs already on them.




Thanks to both of you! I did'nt know i could get them with tabs!
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#3117434 - 09/07/13 07:51 AM Re: soldering on nimh battery [Re: Vikas]
Errtt Offline


Registered: 11/14/10
Posts: 2464
Loc: California
Originally Posted By: Vikas
I had never heard the wife's instrument being refereed as "facial scrubber" though :-)

Ya have now ;>O

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