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Old Jun 08, 2004, 12:22 PM
TeamZiering
enigmabomb's Avatar
Chandler, AZ
Joined Mar 2002
1,860 Posts
Reworking a Pack with a bad cell...

I have a 14 Cell 2600mah Pack that was involved in a SERIOUS crash. One of the cells was punctured, and went nuts. So I have this end to end pack that has a bad cell RIGHT in the middle. Can it be saved? (HOW?!) I can't see a soldering iron fitting between these cells.

-Josh
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Old Jun 08, 2004, 01:58 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Sticks of end-to-end soldered cells will break apart quite easily if cooled first. Put it in the freezer for a little while, or the fridge overnight, then put the stick on the edge of a table with the joint you want to break at the edge. Give it a quick snap, and it will come apart.
..a
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Old Jun 08, 2004, 02:51 PM
Electric Flyer
Connecticut, USA
Joined Oct 2003
430 Posts
I do exactly that but I don't refrigerate them. Once broken, use a good iron and solder the new one in....
BUT.....discharge the pack first.......
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Old Jun 08, 2004, 04:16 PM
TeamZiering
enigmabomb's Avatar
Chandler, AZ
Joined Mar 2002
1,860 Posts
Does one bad cell ruin all the other cells?

GREAT information guys, You probably saved me 80 bucks.

-Josh
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Old Jun 09, 2004, 04:05 PM
Electric Flyer
Connecticut, USA
Joined Oct 2003
430 Posts
No....if the cell opens the pack draws no current.....If it shorts internally, it just shorts that cell.
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Old Jun 11, 2004, 12:33 AM
If it floats....sail it!
FoamCrusher's Avatar
Elk Grove, CA
Joined Sep 2002
4,177 Posts
What about the difference with putting a new cell or cells that has only been slow charged at C/10 and cycled 5 times in with cells that have 30+ cycles on them?

I just added two new cells to an older KAN 1050 8-cell pack to make it 10 cells, and I am wondering what it will do to the pack.

FoamCrusher
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Old Jun 11, 2004, 12:35 AM
TeamZiering
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Chandler, AZ
Joined Mar 2002
1,860 Posts
This pack had about 3 cycles on it.

-Josh
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Old Jun 11, 2004, 06:51 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
The cells could get out of balance and you'd end up damaging more cells in the pack.
3 cycles probably won't make much of a difference, however..
..a
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