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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'>thats a great idea. i wish i knew
how to make something like this.<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>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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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>David Harmon via NSRCA-discussion<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 13, 2016 12:30
PM<br>
<b><span style='font-weight:bold'>To:</span></b> '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>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>Man….that’s
a close call Robert.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>Glad to hear
that your wife handled this situation so well.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>I use a 50
cal metal ammo box too….I used a 5/8” Greenlee chassis punch to
make a hole on the back panel for a pressure relief. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>Hopefully
the hole is large enough to relieve the pressure but still contain most of the
flame.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>Also….if
I have any fully charged batteries after flying I discharge them to 50%
(storage charge)…especially if I know they will not be used for awhile.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>I use a 17
ohm 100W Dale power resistor, a short lead with the correct connector on it to
discharge a 10S battery (connected to the main discharge battery lead)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>This gives a
2.5A constant discharge rate which makes 100W of heat.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>The resistor
can handle that much heat but I put a small fan on it anyway.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>I discharge
them down to about 40% then put on the charger to bring back up to the storage
charge.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>This also
balances the cells and makes the situation a bit more safe…..at least if
one of them blows the energy is about half.<o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D;font-weight:
bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D;font-weight:
bold'>David Harmon<o:p></o:p></span></font></b></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><b><font size=2
color="#1f497d" face="Comic Sans MS"><span style='font-size:11.0pt;
font-family:"Comic Sans MS";color:#1F497D;font-weight:bold'>Sperry</span></font></b></st1:City><b><font
size=2 color="#1f497d" face="Comic Sans MS"><span style='font-size:11.0pt;
font-family:"Comic Sans MS";color:#1F497D;font-weight:bold'>, <st1:State
w:st="on">OK</st1:State></span></font></b></st1:place><b><font size=2
color="#1f497d" face="Comic Sans MS"><span style='font-size:11.0pt;font-family:
"Comic Sans MS";color:#1F497D;font-weight:bold'><o:p></o:p></span></font></b></p>
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<p class=MsoNormal><font size=2 color="#1f497d" face="Comic Sans MS"><span
style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri;font-weight:bold'>From:</span></font></b><font size=2
face=Calibri><span style='font-size:11.0pt;font-family:Calibri'>
NSRCA-discussion [mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Robert Green via
NSRCA-discussion<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 13, 2016 10:15
AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'General pattern discussion'
<nsrca-discussion@lists.nsrca.org><br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion] Lipo
fire<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>
<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>
<p class=MsoNormal><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. <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>
<p class=MsoNormal><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.<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>
<p class=MsoNormal><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.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>thanks,<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>
<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Robert<o:p></o:p></span></font></p>
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