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09-15-2007 04:22 AM  10 years agoPost 1
krashtagain

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ohio

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Can someone explain what happens when a lipo gets puffy ?? What goes on inside the pack , does the liquid start squeezing ou or what ?? What causes them to get puffy ??

If you're not living on the edge you're just taking up space !

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09-15-2007 03:39 PM  10 years agoPost 2
bbeverlie

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Hudson,New​Hampshire.USA

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It's a chemical reaction, basically the cell starts to
boil causing it to expand or puff! You can read some info
at this site under the lithium tech. & safety section!

http://www.rcbatteryclinic.com/

AMA#846952

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09-15-2007 08:11 PM  10 years agoPost 3
lightningrc

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UK

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I think they just expand from the heat but once puffed they never return the same even when cold they fell a little puffy

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09-17-2007 01:18 AM  10 years agoPost 4
702nitro

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Las Vegas, NV

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Don't mean to hijack this thread but..

I have 3 packs (DN 3s10 2150mah 15c) that haven't been used for months. I am confident that the 3s1p lipos had a voltage of 3.2volts or greater per cell before they were put into storage. The problem is it has mild puffing only on one side(on top, and slightly visible noticeable). Its been sitting in the Trex heli case inside my room, and when I last remember the packs weren't in this condition.

I'm still flying the packs, but I am being very cautious!!!
Should I throw the packs away???????????????

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09-17-2007 01:18 PM  10 years agoPost 5
lightningrc

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UK

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No they will still work but you will get less run time and not as much kick

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09-19-2007 02:48 PM  10 years agoPost 6
iskoos

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Orlando, FL

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I TOO Don't mean to hijack this thread but...

The same issue happened to two of my TP 1320 3s1p packs. Slight puffs on the cell #1 and #3. You can only notice it when you touch it. They had no more than 15 cycles on them. One was almost full the other one had less than half charge in it. They were practically new but now!..
This is very disappointing...

What I know is that it is the gas(I guess hydrogen) what is making the cell swell not the liquid...

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09-19-2007 02:52 PM  10 years agoPost 7
lightningrc

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UK

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To stop this happening they must be balanced every time

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09-19-2007 03:14 PM  10 years agoPost 8
bbeverlie

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Hudson,New​Hampshire.USA

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As well as not being run down to less than 3.2v per cell which will cause the pack to puff If you fly till it can't you've flow to long! There are several ways to ensure this dosen't happen,

You can get a system that records battery data during flight which
will tell you what you pulled out of the pack and allow you to
know how long you can fly! I did a 6 min flight with my trex and
an 2200mha S3 pack and the data told me I could run 9 min with
the same flight style! You can also get a charger that balances and
tell you what you put back into the pack and the voltage of each cell.

Knowing this will keep your packs flying much longer, You should
also time your flights. If your TX dosen't have a timer you
can get one at walwart, I have a picture of this in my gallery
on my CP Pro TX

AMA#846952

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09-19-2007 11:27 PM  10 years agoPost 9
krashtagain

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ohio

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Thanks for the input guys . Wonder what Air Thunder is doing to their packs to make them puffproof ???

If you're not living on the edge you're just taking up space !

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