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Repairing a lipo battery - 11/6/2012 6:49 PM   
yakfish



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From: Fairborn, OH, USA
Status: offline 		I have a Turnigy NanoTech 6s 5000Mah 65C battery. It's still new, I charged it and ran it for about 5 minutes when my ESC caught fire. The cells still have just over 4v but when I plug it there is no power. I guess when the ESC shorted, it Shorted something inside the battery as well and something got disconnected inside. I plan to peel off the shrink wrap and have a look to see if there is a connection I can just re solder. Has anybody here done this before? I can't imagine it will be too difficult to do but is there anything I should be looking for? I guess this is the risk we assume when purchasing from hobby king I don't think I will even bother with trying to get a replacement since their CS doesn't have the best reputation in the business plus it probably wasn't defective to begin with anyway. Just wondering if anyone else has tried this and would be willing to share the experience. Thanks.

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RE: Repairing a lipo battery - 11/6/2012 7:38 PM   
Goldenduff


 

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Status: offline 		Before dismantling check the voltages at the balance tap- see if one is wildly different or zero. 

Be careful not to short if you do dismantle solder etc


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RE: Repairing a lipo battery - 11/6/2012 8:29 PM   
yakfish



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Status: offline 		They are all reading around 4.05v. If one was dead or zero wouldn't I still have power from the leads?

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RE: Repairing a lipo battery - 11/6/2012 9:01 PM   
Walt Thyng


 

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Status: offline 		Sounds like the short melted one of the power leads probably at the cell tab. If so you need to preserve the solder as it is specifically for aluminum. You probably should check the leads at the connector as well. If your pack has those proprietary HK connectors there's no much soldering surface.

If you have a problem, PM me as I repair LiPos all the time.
Walt

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RE: Repairing a lipo battery - 11/6/2012 9:18 PM   
t9dragon



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Status: offline 		Time to get a new battery and dispose of the bad lipo....

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RE: Repairing a lipo battery - 11/6/2012 10:17 PM   
guver


 

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Status: offline 		Check voltages at the main negative and pin 2. It should read 4 volts, continue down to pin 7 and the voltage should add 4 every time you move a spot. You can also do this from the main + starting with pin 6 and moving down to pin 1. You should quickly pinpoint where the open is because you are relyiong on one of the main leads each time. When you open the end of it it'll be obvious where the break is (I hope)

I doubt it is internal to any cell becuase you have good readings at the balance tap.

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RE: Repairing a lipo battery - 11/6/2012 11:40 PM   
hugger-4641



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Status: online 		I agree with guver. You should have at least 19 volts if you check power at the main leads, but you said you don't have any. You said you checked each cell and got 4v on each, so you should have at least 24v at the main power leads. Most likely there is a burnt wire or melted solder joint between two of the cells. Some packs use a type of printed circuit film to make the balance connections  and jumper across the cells. If this is the problem, you can solder in a jumper around the damaged portion of the film. Some packs have a printed circuit board with some mosfets and micro chips and such on them. I don't believe that Turnigy pack has this, but if it does, it can be removed. Let us know what you find, but be very carefull not to short anything out while you are cutting into the pack!!!! 

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RE: Repairing a lipo battery - 11/6/2012 11:45 PM   
yakfish



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Status: offline 		Thanks to everyone for the replies and advise. I won't have a chance to work on it until this weekend probably. I will try to remeber to take step by step pics as I go.
Thanks

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RE: Repairing a lipo battery - 11/7/2012 6:00 PM   
yakfish



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Status: offline 		I had a chance to take a look at this battery today before I have to leave for work. Here are some pics. I think I found the problem!







I'm pretty sure that is supposed to be connected! Will regular solder work here? Somebody mentioned aluminum and aluminum solder. Is this tab aluminum or will just regular solder work here? Afteropening it up it looks like it was in fact a defect from the factory. and the ESC fire was a sepperate problem.


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RE: Repairing a lipo battery - 11/7/2012 8:56 PM   
hugger-4641



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Status: online 		If that battery was plugged in when the ESC fried, then the battery was working at that time. That looks more like something snagged the blue balance wire and pulled it loose.  But to answer your question, regular rosin core or silver bearing solder in a small diameter should work well enough, but getting enough heat on that thin foil will be tricky to do without getting too much heat on the cell itself.  It would be good if you had a small ceramic kitchen knife or something similar to use as a heat insulator and slide between the foil and the cell while soldering it. An extra pair of hands to help may come in handy also. Solder has a way of sticking to small connections like that and pulling loose while still hot as you pull the soldering gun away. Another pair of hands to hold the foil in place with chop sticks while you solder between them might work. Or you may be able to Mcgyver some wire bread ties around the pack to hold the foil in place.

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RE: Repairing a lipo battery - 11/7/2012 11:15 PM   
guver


 

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Status: offline 		Definately your 3rd pic shows the open between cell 5 and 6. It looks like they are spot welded , but the the + tab for cell 5 has been ripped in half, right?

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