I'm having a habit of collecting parts that could be usefull at some imaginary point, and I actually had a project that could use a connector plate from such a 9V battery. When one of them got dead, wanted to get that end with connectors out of it - used pliers to bend open the end, and there came my surprise. Two out of 6 cylindrical elements just plain exploded, sending their guts across the room. I was completely not ready for that, since I had collected those parts since childhood without any accidents. So, actually, they can be really dangerous. Since I did not have such batteries in use for many many years, it was actually a surprise to find cylindrical elements inside. When I was doing this some 20 years ago, those batteries contained 6 rectangular elements, stacked in line. On Wed, Jan 30, 2013 at 5:05 PM, Sean Breheny wrote: > As a teenager, much to my delight, I discovered this ability of an > infinite number of 9V to interconnect in this way. Alas, I had only > about 30 of them but I still managed to use this stack of 20 to 30 as > the B+ supply for a triode vacuum tube circuit. I was _extremely_ > careful with it and didn't leave the entire stack connected for very > long. I did not try shorting it as the guy in the video does. > > The guy in the video does seem, to me, to appreciate that there IS a > danger. I think what he does not realize is the importance of using > proper test equipment and test leads, as Russell points out. Also, I > hope that he was wearing good eye protection because the energy > involved could easily have ruptured one or more of those 9V batteries > when he shorted it. I think one thing that saves him is that even > fresh 9V batts have a fairly high internal resistance and these were > not fresh batteries. > > Sean > > On Wed, Jan 30, 2013 at 9:00 AM, RussellMc wrote: >> An insane You tube 'demonstration' of the results of series connecting 2= 40+ >> 9V "PP3" cells. >> >> The commentator has absolutely no idea whatsoever that he is poised on t= he >> brink of death throughout the whole video. >> >> AND, his resul;ts are stunningly feeble, considering he has over 2000V o= n >> hand. >> Apart from some nicish arcs. >> Here, stand aside, let ME show you what you can do with 2000 V ... :-) >> >> http://www.youtube.com/watch?v=3D8hwLHdBTQ7s >> >> DO NOT try this at home. The clip lead insulation could rupture, the >> surface could track, random anythings could explode with immense violenc= e >> and throw misc material at highh velocity. Measuring 990 V DC on a semi >> random digitial multimeter AND holding the leads. Such luck this guy has= .. >> >> If you can educate any of the up and coming generation that such things = are >> able to be lethal at any moment please do. >> >> >> Russell >> >> Ref: Iain M. >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 KPL --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .