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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks Peter. If you have ever seen a
lipo catch fire, there is a screeching noise that they let off, before they
ignite. That was the noise my wife heard and she went out to the tile area by
our front door and discovered that the batteries were on fire.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> NSRCA-discussion
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Peter Vogel via NSRCA-discussion<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 13, 2016 3:02
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Chris Moon; General pattern
discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Lipo fire</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>The only thing that stops me from saying this is the most likely and
plausible scenario is the time lag. If you finished charging an hour ago
and the batteries are just sitting there, what would prompt a short in the
balance leads?<o:p></o:p></span></font></p>
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12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Now, if you had a bunch of batteries in the box, pulled one out, went
flying and left the rest of them in the box in the back of your car or
wherever, sure, I could believe somebody bumping into your stuff would set
things off. But just sitting there in the garage?<o:p></o:p></span></font></p>
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12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Robert, so glad the family + homestead are OK! How did your wife
discover the fire? Fire alarm in the garage or something else?<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Peter+<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Mon, Jun 13, 2016 at 12:56 PM, Chris Moon via NSRCA-discussion <<a
href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>>
wrote:<o:p></o:p></span></font></p>
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<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Glad
everyone is ok there Robert.<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>I have
handled and dissected hundreds of different packs during my time in business,
evaluating samples etc and I can say with certainty the weakest link in our
batteries are the balance leads and their connections to the individual cells.
These are very thin wires that typically are spot soldered to tiny tabs on the
cells and crimped into tiny pin connectors. Insulation of the balance wires
inside a pack is usually a thin piece of cellophane looking tape.There is
little to no strain relief for the wires and we handle and flex them every time
they are charged. I have seen many break off and touch others creating sparks
and possibly could have lead to fires if they were pressed together long
enough. I would bet this is what happened to Robert's pack. The
batteries themselves must pass through pretty rigorous testing including being
crushed with a metal blade without catching on fire before they will be
transported from <st1:country-region w:st="on"><st1:place w:st="on">China</st1:place></st1:country-region>.
These testing documents accompany every large battery shipment so it is highly
unlikely one would spontaneously combust. With an older pack, it most
definitely sounds like an internal short of balance leads.<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Chris<o:p></o:p></span></font></p>
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<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On 6/13/2016 11:15 AM, Robert Green via NSRCA-discussion wrote:<o:p></o:p></span></font></p>
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<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' type=cite>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Hey guys wanted to let you know about an incident I had over the
weekend that caused some high concern. I flew four flights yesterday,
then returned home. I thought I would go back out later and fly three
more, so I charged three more batteries. The three batteries on was
planning on using, were flown the previous day, and were not overly
discharged. I took my kids to the movies as my wife did not want to go,
and that turned out to be the best thing for the family. One of my 2014
packs decided that it no longer wanted to live and decided to catch fire all by
itself. I have always thought that the best time for these to catch fire,
would be during the charge cycle. This incident happened almost an hour
after charging the pack. Keep in mind that after I charged the pack,
there were immediately put into my flight box for storage until I got back from
the movies. After I took them off the charger, the batteries did not see
warm in any way, cool to the touch. I have had these batteries for two
and as far as I can remember - they where not damaged in any way. Due to
my wifes' heroic action, the house did not catch on fire like my toolbox
did. She brought them out to the drive way water on them to kill the
flames. I have been pretty cavalier with packs, leaving them out once
they are charged and not putting them in something safe for storage....those
days are done. If this can happen to a battery sitting with a stored
charge, I will not longer leave my house or family unprotected. </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>I bought a safe yesterday, but apparently that may not be the best
thing for them either as the battery give off a gas and they need to
breathe. In other words if you left them in a safe you may be creating a
bomb scenario. What I did was - several years ago, I bought a metal ammo
case. I removed 3/4 of the rubber around the case allowing for the
exchange of air to occur.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>If any one has any other creative ideas on how they store there
lipos, please contribute to this thread as I think it is important as a
community that we spread the message that this technology which has been proven
to be safe for the most part also can be dangerous.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>thanks,</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Robert</span></font><o:p></o:p></p>
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12.0pt'><br>
<br>
<o:p></o:p></span></font></p>
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<fieldset></fieldset><pre><font size=2 face="Courier New"><span
style='font-size:10.0pt'>_______________________________________________<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>NSRCA-discussion mailing list<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><a
href="mailto:NSRCA-discussion@lists.nsrca.org" target="_blank">NSRCA-discussion@lists.nsrca.org</a><o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><a
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></span></font></pre></blockquote>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
_______________________________________________<br>
NSRCA-discussion mailing list<br>
<a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
<a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br clear=all>
<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>-- <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Director, Fixed Wing Flight Training<o:p></o:p></span></font></p>
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<p class=MsoNormal><st1:City w:st="on"><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Santa Clara</span></font></st1:City> <st1:place
w:st="on"><st1:PlaceType w:st="on">County</st1:PlaceType> <st1:PlaceName w:st="on">Model</st1:PlaceName></st1:place>
Aircraft Skypark<o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Associate Vice President, Academy of Model Aeronautics District X<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Treasurer, National Society of Radio Control Aerobatics (NSRCA)<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><img border=0 width=200 height=154 id="_x0000_i1025"
src="http://farm8.staticflickr.com/7163/6513778381_5569cc985d_m.jpg"><img
border=0 width=200 height=136 id="_x0000_i1026"
src="https://googledrive.com/host/0B4LOPeyGAgOJUVJmU1dJMVl6WWc/AcademyModelAeronauticsLogo.png"><o:p></o:p></span></font></p>
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