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roofles.
Offline
Posts: 1,982
Join Date: Oct 2008
Location: Woodland Hills, CA
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08.07.2010, 06:45 PM
Wow, you just have terrible luck in the hobby Freeze.
If you can, you could always pluck one cell out, and have a plinking session with the puffed one (Springfield 9mill?)
And you can save one cell, and possibly resell it?
Just thinking out aloud.
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Guest
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08.07.2010, 07:10 PM
Guy at LHS said I should charge the bad Lipo at a really low rate, like .2 amp to try and bring the cells back to life and keep it from getting warm due to the cells being discharged that low. I was charging it at 1c o 5 amps when it started to get warm and he said thats really bad for Lipo's like this one that have been discharged really low, you need to charge it very low to bring it back to life.
I'm trying the very low charge and so far so good after almost an hour, puffing has decreased as well.
Last edited by Freezebyte; 08.07.2010 at 07:26 PM.
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RC-Monster Aluminum
Offline
Posts: 929
Join Date: Mar 2009
Location: Las Vegas NV
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08.08.2010, 03:02 AM
Quote:
Originally Posted by Freezebyte
Guy at LHS said I should charge the bad Lipo at a really low rate, like .2 amp to try and bring the cells back to life and keep it from getting warm due to the cells being discharged that low. I was charging it at 1c o 5 amps when it started to get warm and he said thats really bad for Lipo's like this one that have been discharged really low, you need to charge it very low to bring it back to life.
I'm trying the very low charge and so far so good after almost an hour, puffing has decreased as well.
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if i were you, i would keep doing this. if the swelling is going down and i is charging, keep working at it. after a few more tries, if is still doesn't work, pluck the bad cell out and save the other one for a spare. then, take the bad cell, hook it up to a car battery, and watch the fireworks
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.
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RC-Monster Admin
Offline
Posts: 14,609
Join Date: Nov 2005
Location: Des Moines, IA
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08.07.2010, 07:48 PM
Personally, that's the risk you take for buying lipos at such cheap prices. When they work, they work well. At least if they are bad, they're not expensive to replace.
I would just get another pack. Then, disassemble the bad pack and save the good cell in case a future cell goes south.
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Guest
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08.07.2010, 08:11 PM
Quote:
Originally Posted by BrianG
Personally, that's the risk you take for buying lipos at such cheap prices. When they work, they work well. At least if they are bad, they're not expensive to replace.
I would just get another pack. Then, disassemble the bad pack and save the good cell in case a future cell goes south.
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Not gonna bother with that risk, me and my friend are gonna go smash it and watch the fireworks. Might as well get something outa this...
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RC-Monster Carbon Fiber
Offline
Posts: 433
Join Date: Oct 2007
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08.07.2010, 08:52 PM
One of the cells would still be good. If you save it and keep the deans on it then when you get the extra 2s pack, you could use it to run 5S in your truck. You would just put all the cells in series. its still a 40C 5000mah cell thats in there. There is not much risk to taking that pack apart and just pulling the bad cell off.
5S is a sweet spot for the MMM. If you gear it down to the same speed on 4S your motor and speed control will run cooler, plus you dont have to push the MMM to the limit at 6S.
Last edited by hemiblas; 08.07.2010 at 09:05 PM.
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RC-Monster Brushless
Offline
Posts: 3,156
Join Date: Jul 2005
Location: Gramercy, LA
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08.08.2010, 07:54 AM
Send that bad pack to me. I'll revive it and use it my my low amp draw vehicles...
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Guest
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09.09.2010, 01:54 PM
Just buy Hyperion and you wont have to worry about anything. Just get the VX or EX versions. They are more expensive but well worth it. And they fit perfect in the ERBE batt. trays, no modding/hacking needed.
http://www.allerc.com/product_info.p...oducts_id=4797
http://www.allerc.com/product_info.p...oducts_id=5471
I personally use the EX version and they are absolutely awesome. I have never once pulled a pack out after a 15-20min race and had the pack above 110*F, and that was on a 91*F day. Oh and I charge @ 2.5c and the batts are at ambient temp after charge.
My racing buddy uses the VX version and they are awesome as well. The only reason I went for the EX was my LHS has them for only $5 more.
I have a brand new set of the Turnigy 2s 5000mah 40c, but I dont really want to hack my battery doors to make them fit.
Worry about winning, not your lipos.
Pete
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09.09.2010, 02:07 PM
1. This thread is a month old, why bump it?
2. I sold the Lipos
3. I bash, I don't race and after paying premium for racing SMC lipos last year and having both sets crap out because they were so "picky" about being maintained, i'll never pay high prices for Lipo's again. End of discussion
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RC-Monster Aluminum
Offline
Posts: 897
Join Date: Mar 2010
Location: Same town as "Brand P"
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09.09.2010, 02:23 PM
Quote:
Originally Posted by Freezebyte
1. This thread is a month old, why bump it?
2. I sold the Lipos
3. I bash, I don't race and after paying premium for racing SMC lipos last year and having both sets crap out because they were so "picky" about being maintained, i'll never pay high prices for Lipo's again. End of discussion
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Why are you such a @$%& ???
Built Ford tough, with Chevy stuff.
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Guest
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09.09.2010, 05:13 PM
Quote:
Originally Posted by Freezebyte
1. This thread is a month old, why bump it?
2. I sold the Lipos
3. I bash, I don't race and after paying premium for racing SMC lipos last year and having both sets crap out because they were so "picky" about being maintained, i'll never pay high prices for Lipo's again. End of discussion
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Oh shit! My bad.
And FYI: SMC are trash.
Last edited by Drivinfast247; 09.09.2010 at 05:23 PM.
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Guest
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09.09.2010, 05:38 PM
Quote:
Originally Posted by josh9mille
Why are you such a @$%& ???
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Quote:
Originally Posted by josh9mille
I have a friend (more of like an aquaintance) that has extreme OCD. He is fun to be around just for entertainment value, but after a while you just wanna bitch slap him upside the head ant tell him hes a moron.
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How cute, you answered your own question and didn't even realize it.
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8th scale Stunt-Driver/Mechanic
Offline
Posts: 441
Join Date: Dec 2008
Location: SoCal
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09.09.2010, 06:37 PM

You give the guy shit to grow some skin and take it like a man, Now he has; and all of a sudden He is the ass.
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Fat Kid Engineering
Offline
Posts: 3,634
Join Date: Jun 2009
Location: Hot as Hell West Central Coast Florida
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09.09.2010, 02:39 PM
No shizz Freeze, and you said I was an asshole ??
I retired from RC, now life is all about guns and long range shooting.
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Something, anything, nothing
Offline
Posts: 2,747
Join Date: Mar 2006
Location: Houston, TX
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09.09.2010, 03:36 PM
Come one, no need to dump on freeze that bad. He is just a little different, but fun to have around. Hardly a$$h@le material there. Kind of like a nervous chihuahua.
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