[NSRCA-discussion] Battery puffing question?

[Dave]

Chuck,

 

I try to do a couple break-in runs on new packs (reduced amps, 40-50%
discharge), and if they sit for more than a month, I try to go easy on them
for the first run - I'm usually to lazy to switch to a smaller prop, but
I'll go easy on the throttle, and keep the flight duration short.  If they
really sit for a long time (2-3 months), then I'll do the "new" break-in
again.

 

Dave

 

 

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Charles
Hochhalter
Sent: Sunday, November 02, 2008 11:57 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Battery puffing question?

 


Dave, i think you just described how i feel most days using the puffy lipo
explanation, hahaha...

 

good complete explanation tho, thanks...

 

I had not heard about not running them hard after sitting, by this do you
mean after winter "breaking them in" again with a few flights before contest
grade flying again?



--- On Sun, 11/2/08, Dave <DaveL322 at comcast.net> wrote:

From: Dave <DaveL322 at comcast.net>
Subject: Re: [NSRCA-discussion] Battery puffing question?
To: aabdu at sbcglobal.net, "'General pattern discussion'"
<nsrca-discussion at lists.nsrca.org>
Date: Sunday, November 2, 2008, 4:05 PM

I don't think you can 100% define when/why a lipo puffs, but you can
generalize some points which increase the odds of a lipo puffing -
- deep discharging is bad
- leaving charged while idle is bad
- exceeding 130F is bad
- running it hard after a period of rest is bad
- older lipos are more likely to puff
 
All of the above are relative, ie, there is no magic number for % discharge
that will guarantee "X" number of cycles.  Combining one or more of
the
above is an additive effect - leave an old lipo sitting charged, and then
heat it up running it hard in hot weather and use 80+ % capacity, and that
is the most likely to result in puffing - and if it doesn't, that would
still seem to be the scenario that will shorten the life the quickest.
 
Once a lipo has puffed (or been dented, bent, or otherwise mechanically
mangled), it may or may not show any short term degradation in performance
(imbalance, reduced power, running hotter, etc) - but you can bet the odds
of it puffing are increased and the performance is more likely to decrease,
and the longevity of the pack is decreasing.  Once a lipo starts to
noticeably deteriorate in performance, the deterioration is usually pretty
fast.
 
Regards,
 
Dave Lockhart
 
 
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Anthony
Abdullah
Sent: Saturday, November 01, 2008 5:01 PM
To: General pattern discussion
Subject: [NSRCA-discussion] Battery puffing question?
 
I have a Zippy-H 2200mah 3S pack that I use in a small electric plane. I was
flying it today and it the plane lost power pretty quickly. I landed and
noticed that the battery had puffed on me. It was warm to the touch but not
hot. I let it cool but it is still a little puffy almost like a ziplock bag
with a little air in it.
 
Question: Should I try to cycle the pack or just chuck it and move on? Are
Lipos kaput once they puff or can they still be used? I didn't abuse the
pack and it barely flew long enough to warm up.
 
Thanks for any info and suggestions.
Anthony
 
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