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New LiPo defective

Old 12-14-2011, 07:41 AM
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Flynow1
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Default New LiPo defective

I received 2 ea. 2650 mah 4S 25C (Nano-Tech) batteries from Hobby King. I had the batteries stored for about a month waiting for an ESC and motor to arrive. I tried charging the batteries last week. One is fine; the other however will not get above 15.2 volts. Cell # 3 reads low, about .5v to 1.5v lower than the other cells while charging, balancing, storing, discharging, whatever, it's low. I have read that there are some ways to possibly get it going. I think I have tried everything in the normal method with no results. (discharging to 12V, charge at .2 amps, balance or store at very low rates and etc.) I have a safe metal can for charging so anything I do can't make it worst. It's not useable now.
Naturally they did not warranty it.
Any thoughts?
Thx
[&o]
Old 12-14-2011, 07:50 AM
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Walt Thyng
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Default RE: New LiPo defective

Isolate the low cell and charge it at .5C. Check it frequently to avoid overcharge. If you can get it to 4-4.2 volts, discharge it to 3.7v using again a .5 C rate and bring it back the average pack voltage; then cycle the whole pack and see what happens.

In my experience this rarely works, but every once in a while I can save a bad pack this way. I've never tried it on Nano-tec cells.
Walt
Old 12-14-2011, 08:03 AM
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TheWoodCrafter
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Default RE: New LiPo defective

Get rid of the pack.

That cell will always give you trouble.

May be too late to return it.

Old 12-14-2011, 08:19 AM
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Goldenduff
 
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Default RE: New LiPo defective

Chop out the bad cell and use as a 3cell. You will need to replace the balcance lead with a 3cell one. It is for this reason that when my packs die (naturally or otherwise!) Ichop all the leads off and keep them.

You are probably better getting another pack- think hobbyking do warranty these for a month after they ship them, so you gotta be quick as you end up with a week to test them (also I think you have to add their serial number somewhere on their site. I'm in Scotland so they never arrive in time for me!)

Good luck
Old 12-14-2011, 03:19 PM
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ftherrmann
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Default RE: New LiPo defective

Two of four lipos I just bought from HK were defective... See this link for the thread I just started..

http://www.rcuniverse.com/forum/m_10859628/tm.htm

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