I've punctured one of non-cased lipos running a MQ SE around on a trash pile - stick sharp enough got under body (which is easy on the MQ) and wouldn't you know, stuck a hole in corner of the lipo. I've since lowered the shell a lot so that won't happen again.

It didn't explode and I had plenty of time to get body off after I saw smoke and get batt out. It never blew up, it just kinda vented and swelled at the same time - only the cell that was punctured, the other never got involved. It got hot - prob enough to melt my chassis, but never exploded, but it generated a ton of smoke - my neighbor came out to say WTF have you done now, lol!!!

I think the airplane guys is where this urban legend on lipos "exploding" must of came from and those were diff chemical formulations of the lipo media versus whats inside them today.