Google this: "Low voltage, the incompetent ignition source". I saw an incident where a failed mosfet in an H-Bridge led to sustained ignition of a PCB and flames escaping the casing. The power supply involved was a 24V 3A unit which was in "hiccup" mode during the failure, delivering a peak voltage of 3V and current of 8A to the failed circuit. Total average power input was about 1W. The failure took several hours to progress past "dead mosfet", then it went to pulsating starlike crater in mosfet, then on to flaming PCB. Not the same thing, but the author of the paper contends that there is enough energy in a lithium coin cell to cause ignition. On Thu, Jan 30, 2014 at 5:30 AM, Mark Hanchey wrote= : > On 1/24/2014 12:31 PM, Robert Dvoracek wrote: > > There are tons of iffy 18650 battery packs floating around out there > > that have a single temperature sensor somewhere inside a big pack of > > 18 or more cells. > > I see a lot of packs that have no protection at all, just cells and > shrink wrap. > I really dislike the 18650 battery design because they are very easy to > short with the anode and cathode usually separated only by 1mm plastic. > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .