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› Gens Ace 5500 cell went dead for no reason WTF!!!
12-01-2011 01:42 AM  5 years agoPost 1
flyride

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Salt Lake City UT

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I have the Gens Ace 5500 6s packs with maybe 30 flights on my 550 and I have had them stored for about 3 weeks at 3.85v per cell (was out flying them 3 weeks ago) and I went to charge them today and one of the cells is dead. My charger said it was a 5s pack so I charged it a bit without the balancer to try to see if the cell would come up a bit, I put about 300mah in it then swiched over to balance charge and the cell now read .20 below the other cells (was at like 3.65) and looks like it doesnt want to come up to full charge(been at 3.91 for a while now). My hope was to revive the battery by doing a few cycles but it looks like it is shot. Why would one cell just crap out like that and in such a short amount of time?

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-01-2011 02:50 AM  5 years agoPost 2
jgalen0025

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royersford, pa- US

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Dont waste your time you have a dead cell. Call hobbypartz I am sure they will sort it out. I have owned every brand of lipo in the last few years and every one of them had atleast one failure. Since then I only own gens ace as after owning almost 100 packs( gens) I have had only 2 come with dead cells and they were replaced free of charge.

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12-01-2011 03:01 AM  5 years agoPost 3
3Dmuse

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Ontario, Canada

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@ jgalen0025

Dont waste your time you have a dead cell. Call hobbypartz I am sure they will sort it out. I have owned every brand of lipo in the last few years and every one of them had atleast one failure. Since then I only own gens ace as after owning almost 100 packs( gens) I have had only 2 come with dead cells and they were replaced free of charge.
You have 100 Gens Ace packs? That's an impressive number. May I ask why you need that many packs?

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12-01-2011 03:14 AM  5 years agoPost 4
Bubba Gump

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Dayton, Oh

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What charger you using. Are you using a nice high end charger like hyperion or the powerlabs.

Team Compass Models, Team Hitec and KBDD

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12-01-2011 03:26 AM  5 years agoPost 5
flyride

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Salt Lake City UT

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I am charging on an Icharger 3010. I am trying to bring the cell up to the others then cycle them to see if there is any hope.

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-01-2011 03:39 AM  5 years agoPost 6
Bubba Gump

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Dayton, Oh

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Thats really weird never had a pack do that that was at storage charge

Team Compass Models, Team Hitec and KBDD

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12-01-2011 03:43 AM  5 years agoPost 7
alexf1852

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Inverness, FL - U.S.

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Make sure you have a good connection on the balance tap. Sometimes you might have a busted balance wire. What's the voltage on the discharge leads?

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12-03-2011 04:31 AM  5 years agoPost 8
flyride

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Salt Lake City UT

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Well I balanced charged the battery and it came up to voltage and then cycled it and it still has capacity it should so I think I may get a few more flights out of her after all. I will put a flight on it and moniter the voltage after to see if it is still the same as the rest. It seem like it just discharged the one cell over a few week period so I may just have to cycle it twice a month or so we will see.

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-03-2011 02:24 PM  5 years agoPost 9
3Dmuse

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Ontario, Canada

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I had a pack that behaved like this, and the bad cell never again held the charge for more than a few days and eventually only hours. In flight it would loose the charge twice as fast as the good cells. I hate to say it, but the "bad" cell will never be good again. Hope I'm wrong though.

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12-03-2011 04:43 PM  5 years agoPost 10
flyride

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Salt Lake City UT

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It may not but I am not giving up without a fight.

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-03-2011 05:30 PM  5 years agoPost 11
rexxigpilot

rrProfessor

Florida

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You are wasting your time. LiPo is not like NiCd where you could revive a low cell. I would not even fly with that pack as the voltage could drop far below 3.0 under load and a fire could result. It's not worth the risk.

Since you have an ICharger, check the IR on the individual cells and let us know what you find. That bad cell will likely have a very high IR.

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12-03-2011 08:08 PM  5 years agoPost 12
flyride

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Salt Lake City UT

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Cell #6 is the one that was dead and here is the IR for the cells in order from one to six (1,1,2,2,2,3). So the IR is still way low I think it will be fine but I need to do a few flights to test it.

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-03-2011 08:29 PM  5 years agoPost 13
rexxigpilot

rrProfessor

Florida

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The IR on cell 6 is more than 10% out of line with the others. That's the general rule for a matched pack - 10%. Your measurments show the pack is not good. However, the ICharger is not the most accurate at measuring IR. You may want to test on say a PL8 to get a more accurate reading. I take any pack with a cell(s) that has a 50% higher IR than the cell with the lowest IR out of service. You have 4 cells that exceed that! The IR imbalance will show up in pack performance. The imbalance will also get worse quickly. Maybe you can hover for a dozen times. You'll see.

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12-03-2011 08:45 PM  5 years agoPost 14
flyride

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Salt Lake City UT

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Well if that is the case every battery I own is bad and has been bad from the start. All my packs IR is between 1 and 3 per cell. I am not saying you are wrong by any means and more then Likly you are spot on but It may be the charger that is not accurate and also it doesn't read like 1.7 or 1.1 I think it just goes to 2. But all my batteries work great with those numbers and some have been good for two seasons. I dont know if the battery will work or for how long but if I can only get a few hovers more then I will just practice piro hovers etc.

and the blonde said "RECTUM, Hell damn near killed em!!"

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12-03-2011 08:54 PM  5 years agoPost 15
TheWoodCrafter

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Costa Mesa, Ca.

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The IR on cell 6 is more than 10% out of line with the others. That's the general rule for a matched pack - 10%. Your measurments show the pack is not good.
Do you really think it is that bad since the readings are so low? I could believe that if cell 6 was maybe 10mohms or something out of the neighborhood.

Since the iCharger doesn't show any decimal -
Cell 1 could be 1.4 and reads 1 and cell 6 could be 2.6 and reads 3.
But it is actually only 1.2 apart.

And besides the difference between cell 1 and cell 2 is 50% not 10%.
You are right he may want to measure it again on a Cell Pro but I don't think the values are far enough apart to worry about.
I would run it again and keep an eye on it.

Thanks, TheWoodCrafter

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03-09-2012 05:55 AM  5 years agoPost 16
flyride

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Salt Lake City UT

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Update.

The battery pack is holding a charge just fine and I have had it out for quite a few hard flights and it still has all its power and now balanced just fine and I have had it at storage charge for a while and it holds voltage fine, the pack seems to be just fine. I like these gens ace packs they are great. I don't know why one cell went dead but seems fine now.

A little history on the pack.
Last fall I did run the pack for 5 min flight and thought I changed it but didn't and put a 4 min flight back on it before it cut out and I had to auto down then I realized I had used the same pack and drained it down to almost dead but after that I charged it and flew it the rest the year with no problem then while in storage the one cell went dead. I revived it so to speak and after a few hard flights it seems to be just fine so I will keep my fingers crossed and keep flying it.

and the blonde said "RECTUM, Hell damn near killed em!!"

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03-09-2012 06:10 AM  5 years agoPost 17
Shortman

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Portland, Oregon

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I have 6 Gens Ace 25C 6S 3800mah packs and have been doing some IR testing with the iCharger 306B. When you take your IR make sure the packs are at storage charge and at room temperature. Taking IR readings is tricky because when the batteries are cold (i.e. in storage) the IR's will more than double versus the same pack being left at room temperature for an hour. When the packs are in flight they go even lower.

My packs (have 7 cycles now on each one stored at 3.85V in 35-40F temps then brought to room temperature for over an hour at 61F)

5th cycle of all batteries @ 61F

Pack 1A: (3,2,3,5,2,2) total 17mΩ

Pack 1B: (3,3,3,3,3,2) total 17mΩ

Pack 2A: (3,3,3,3,3,3) total 18mΩ

Pack 2B: (3,2,4,3,3,2) total 17mΩ

Pack 3A: (3,3,3,3,3,3) total 18mΩ

Pack 3B: (3,3,4,4,3,3) total 20mΩ

I retested them tonight....

7th cycle of all batteries @ 61F

Pack 1A: (3,2,3,5,2,2) total 17mΩ

Pack 1B: (2,2,3,3,2,2) total 14mΩ

Pack 2A: (3,2,3,3,2,2) total 15mΩ

Pack 2B: (2,2,3,3,2,2) total 14mΩ

Pack 3A: (2,2,3,3,2,2) total 14mΩ

Pack 3B: (3,3,3,3,3,2) total 17mΩ

Just after two more cycles the IR is still dropping on all these packs with the exception of Pack 1A. I should mention this pack when I first tried to plug it into the balance board, I tried to put it in backwards therefore shorting the balance lead for a fraction of a second as I realized I had it upside down. This could be the reason for the pack having a higher IR reading and cell 4 being a little out of wack.

When I charge these packs to full 4.2V per cell the IR drops even lower (0-2 mΩ per cell). I also have one cell in Pack 1A, 4th cell that has a high IR compared to the rest, I am watching it like a hawk but it performs fine thus far.

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