I'm new to this forum, I joined for help in buying a new torch (flashlight - I'm a Brit) and have been very grateful for all the help I’ve got so far, but the discussions regarding exotic chemistry battery's exploding has got me very wary, and I’m interested in how worried I should really be and how much of it is actually paranoia, so…

Have you ever had a cell(s) explode or vent in an undesirable and unexpected way (it doesn’t count if you were trying to make the cell explode or vent)

please state; what chemistry was the cell (regardless of outcome)? What were the circumstances?