It is funny how now companies are selling high capacity Lipos. check out the links bellow of my 12000MAH that I have. I tested them for a few years before they lost all the charge. I had 2 packs, but I shorted one out to see if it would catch on fire and/or explode and it didn't. I even cut the cell open and nothing happened. The packs lasted 3yrs and a little over 1000 cycles. I had them since 1999.
http://www.rcpics.net/view_single.php?medid=80310
http://www.rcpics.net/view_single.php?medid=80309
http://www.rcpics.net/view_single.php?medid=80308