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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><p class=MsoNormal><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></p><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>David Harmon<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'>Sperry, OK<o:p></o:p></span></b></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Comic Sans MS";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> NSRCA-discussion [mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Robert Green via NSRCA-discussion<br><b>Sent:</b> Monday, June 13, 2016 10:15 AM<br><b>To:</b> 'General pattern discussion' <nsrca-discussion@lists.nsrca.org><br><b>Subject:</b> [NSRCA-discussion] Lipo fire<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;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></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;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></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;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></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'>thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:navy'>Robert<o:p></o:p></span></p></div></body></html>