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Old 04-27-2011, 08:48 PM   #1
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Puffy Lipo Question

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I just picked up a used 2wd slash and was playing with it over the weekend. With one of the lipos I ran it too long and drained all the power out of the battery. I was going to charge it today and see if I killed it or not, then I noticed that it was a little puffy compared to my 2 other lipos (same size & brand) I honestly did not notice if it was like that before I started running it or not. My first instinct after reading up is that I should just junk the battery and get another one, but I am not sure if a puffy battery is a puffy battery no matter how little it may be puffed.
I am new to electric and have been playing with nitro for the longest time so I am not 100% sure what I should do with it or if I should try charging it (I would charge it outside on my paved path in a fireproof bag that I have of course).
I'm looking for opinions from seasoned guys on what they would do.
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Old 04-28-2011, 07:30 AM   #2
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Re: Puffy Lipo Question

I had a turnigy 5000 20C I was running in my one blitz, after 10 runs/charges I noticed it was puffy in the hard case. I took the case apart and poked a hole in the puffy cell with a stick pin (making sure I never touched the lipo inside) and glued the hole shut with CA (seen a few people do this on RCU) and used it about 10 more runs till I saw that the run times was getting low after a balance charge. I watched it charge one day and seen that it was only getting 2600mah in the one cell so I took it apart and disposed of the bad cell in salt water and threw it out.
Oh... yeah If you run a lipo on a non lipo esc I would suggest going back to nimh or getting a lipo cut off alarm so you know when to stop running, ruined a $130 trackpower gold 4900 that way .
If you're planning on way-overpowering your plane and "flying like a maniac", you might consider gluing the tail feathers down to avoid flutter.
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Old 04-29-2011, 12:17 PM   #3
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Re: Puffy Lipo Question

In my opinion, a puffed LiPo battery is very near it's useful life! Normally, I would cut off the leads, one lead at a time, so as to keep the leads from shorting, put a piece of electrical tape around the cut leads, and dispose of the battery safely. Most retail stores now have drop off stations for used batteries!

Buying a new battery is much safer and more cost effective than trying to bring a puffed battery to life! It just takes one fire...

Also, a LiPo cut-off, built-in or otherwise, is an excellent idea! To be safe, I set my cut-off to 3.4v per cell.


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Old 04-29-2011, 12:31 PM   #4
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Re: Puffy Lipo Question

I'm actually planning on picking up 2 new batteries tonight. I am looking at swapping to an esc that have a LVC built in or if not getting a standalone LVC (looking at the novak unit). I'm sure the battery is toast as I've narrowed it down to the puffing coming from the battery being completely drained. Lesson learned
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Old 04-29-2011, 02:11 PM   #5
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Re: Puffy Lipo Question

You can soak the leads with the connector on in salt water for a couple days. This will ensure that it's fully discharged...it can then be safely put in a dumpster. Many fire halls will take them too.
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