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Lipo puff...how much is too much?
#1
Greetings all.....

Was prepairing to charge a battery (1500 mah 3S Zippy) and I noticed it had started to puff just a little.  I didn't include a pic because I don't think it would show up in the pic very well.  This battery has about 45 cycles on it and has an IR of 4, 7, 5 for cells 1, 2, 3 respectively.  Should one trash the battery as soon as any puffiness is noticed, or can a little be lived with??  Thanks guys....
#2
I have several 4S lipos that Puff up a lot after a fast run, granted they all have about 75 cycles on them, They get real hot, and flight times have decreased quite a bit. after they have cooled down enough I will charge them under a watchful eye and they always charge fine, But they are near on end of life.

Just keep an eye on them, and if they drop a cell, ditch them..Of course discharge them first and do the salt water trick and dispose of them properly.

I have heard of people fixing a dropped cell by charging for a while on Nicad or PB settings to boost the cell up...I do not recommend anyone do that, as it does have the potential for a fire, and besides, if the cell is bad it will only fail again..so ditch it.

While Lipos can be costly, they are I am afraid, a disposable item.
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[-] The following 2 users Like BigglesFPV's post:
  • sloscotty, sirdude
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#3
Thanks Biggles...I just wasent sure if the slight puffing meant I needed to trash it right away.  It's performace hasent declined that I can tell. Ill keep it in service under as you said, a watchful eye.  Thanks. Big Grin
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#4
I don't think anyone can give you a definite answer I am afraid... LiPo is one of those things that always has a chance to go "boom", going buff up is just a sign that it's more likely to do so (especially when charging)
If you can afford new pack to replace it, do it Smile I personally had quite a few puff ones and carried on using them 20/30 cycles after noticing it. Eventually they get so puff I retired them. A bit risky, but didn't burn my house down LOL
A better FPV'er than LOS'er :) -- My Fleet
[-] The following 1 user Likes Oscar's post:
  • sirdude
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#5
(08-27-2016, 01:09 PM)Oscar Wrote: I don't think anyone can give you a definite answer I am afraid... LiPo is one of those things that always has a chance to go "boom", going buff up is just a sign that it's more likely to do so (especially when charging)
If you can afford new pack to replace it, do it Smile I personally had quite a few puff ones and carried on using them 20/30 cycles after noticing it. Eventually they get so puff I retired them. A bit risky, but didn't burn my house down LOL

Thanks Oscar, that was kind of my plan all along, just to watch it carefully and be care not to discharge it to much while flying. I have a large heavy duty stainless steel container with a heavy lid that I keep all my lipos in when not charging or flying them. Appreciate the response. : )
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