04-24-2011, 09:20 AM | #1 |
Quarry Creeper Join Date: May 2010 Location: Plumas county
Posts: 208
| Quick lipo question
Ive just bought a 3s zippy. Charged once full charge. Discharged down to 3.3 3.4 3.3. Balanced to 3.8v per cell and came back a week later to charge. Saftey timer hits and the pack reads 4.2 4.2 3.8. In the past when a cell doesn't charge I've believed it's bad. Hk is telling me it's good and they won't warranty it due to the traxxas connector I've soldered on. Yay. So basically the third cell will discharge and only charge to 3.83 on balance charge. Safe to say it's dead? No swelling No punctures Wasn't hot No indents or bends or water Or should I try to cycle it? I can take off all the wrap and cycle that cell alone if you think it'd help. also if I do that I can chop out the cell if it is toast. Thanks in advance for the replies/comments/help |
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04-24-2011, 10:01 AM | #2 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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Run it a little and try again.
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04-24-2011, 10:15 AM | #3 |
Quarry Creeper Join Date: Jun 2010 Location: Ireland
Posts: 433
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Safety timer?
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04-24-2011, 10:25 AM | #4 |
Quarry Creeper Join Date: Sep 2010 Location: Central MN H-Town
Posts: 291
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what charger are you using??
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04-24-2011, 10:36 AM | #5 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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04-24-2011, 10:37 AM | #6 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
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Hvrc, I agree with the others, run it again. I don't think it's dead, but only time will tell.
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04-24-2011, 11:04 AM | #7 |
I wanna be Dave Join Date: Dec 2009 Location: San Francisco
Posts: 2,236
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Make sure you have your charger set to balance.
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04-24-2011, 11:30 AM | #8 |
Proverbial threadkiller Join Date: Feb 2011 Location: Central Wisconsin
Posts: 1,453
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Can you set your charger up to charge a 1 cell lipo? Then you could just charge that individual cell through the balance adapter (not sure I'd exceed 2 amps through those small wires, though).
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04-24-2011, 11:32 AM | #9 |
Quarry Creeper Join Date: May 2010 Location: Plumas county
Posts: 208
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It's an accucell 6, just tried my friends hyperon with the same result. I found the same spec cell in my electronics bin from a 2cell that puffed on one. My pack is a 30/40c and this cell is a 40c. So I've chopped and soldered, going to have him see if he can cycle that cell some on his home made drainer. The safety timer is mentioned above. 120min and it cuts off. The only time I cut it off is when I slow charge. I'm done buying 3s packs from hk. Thankfully I've got a few guys that give me their damaged packs or I wouldn't have a cell to put in. I've ran the moded pack, and it drained perfectly balanced. I'm charging it now to see the out come, so far so good. Yes, there is an option for 1cell lipo, no it's not through the balance tap as on a single cell there's nothing to balance, it's a traxxas adapter with alligator clips (used for charging the pb batteries) Thanks for all your help guys. After he cycles that pack some I'll post the results as I also do like a "matched" set of cells. Last edited by Hvrc; 04-24-2011 at 11:34 AM. |
04-24-2011, 01:13 PM | #10 |
I wanna be Dave Join Date: Sep 2008 Location: four o six
Posts: 2,101
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Im with Duuuuuude, run it for a bit. when you put a balancer on it does it show that the 2 cells are higher??? how about charging at like .5V and use a balancer on it??? never had one like that before. use a lipo sack just in case |
04-24-2011, 07:19 PM | #11 |
Quarry Creeper Join Date: May 2010 Location: Plumas county
Posts: 208
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Update! The single cell has puffed at my friends house! Was being discharged at 30amps and charged at 3amps. He said it started hitting 4v after the second cycle and then swelled a bit. So it was getting better and then dumped. But it was only taking 9-1000ma on each cycle. Being a 3000 I was expecting at least 2000. Well, thank you everyone for your advice and help on it! Looks like I'm staying with the make up cell for awhile. |
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