Even tiny hearing aid batteries ... supposedly "dead" ... among pocket change can explode with a surprising amount of energy.
73 Ken - K0PP On Feb 18, 2017 7:34 PM, "Jim Miller" <jimmil...@stl-online.net> wrote: > It has been a long time but... I had a battery in my pocket (not sure any > more but probably a 9v), no change in the pocket and do not remember what > it > was that caused the problem (probably my knife) but something apparently > shorted the terminals and I felt uncomfortable, jostled my pocket, then > warm, then hot and HAD to get whatever it was out. I burned my hand. The > battery got MUCH hotter even after it was out. It would have caused a > serious burn to my leg had I not removed it. I could only describe the > situation as an avalanche failure inside the battery. > > I will not forget that experience and never put batteries in my pocket of > where they can short any longer. > > 73, Jim KG0KP > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don > Wilhelm > Sent: Saturday, February 18, 2017 6:01 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] ECOM scare -- FW: Soldering lesson > > I was involved in product testing in my former career. > One large computing machine which I worked on had a backup battery > consisting of 4 AA cells, which no-one thought would be a problem, but > during environmental testing at shipping extremes, condensation formed and > created leakage paths. It was a hard sell to convince management and many > engineers that AA cells could cause a problem. > > The following action was to do extensive testing in the power systems lab > in > which several destructive tests were performed, which included shorting the > battery pack terminals. > > It is amazing how much current those "lowly" AA cells can produce in a > shorted situation. Under short conditions, they are just as powerful as > any > other battery, but the duration of the huge current discharge is shorter > than for larger batteries. > > Lesson I learned is to be careful with any battery. High density battery > chemistries make the short circuit discharge duration longer and can cause > more damage. > > 73, > Don W3FPR > > On 2/18/2017 6:25 PM, Rick WA6NHC wrote: > > > Don't forget that some of the battery packs we commonly use now > > (LiFePo4 is my example) are capable of tremendous current (mine are > > 'fused' by a BMS at 100 amps). > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message > delivered to jimmil...@stl-online.net > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to elecraftcov...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
