Hi, I don't know if any if you guys have watched or follow a guy on YouTube called Rich Rebuilds? He fixes and rebuilds damaged or written off Tesla cars. In his latest videos he has put a couple of Tesla battery packs in an old electric kids car...as you do...just to make it faster!! Anyway all was going well until for some reason the packs caught fire in his friends garage...well to say the least the resulting fire and batterys exploding was like something out of a war zone...like a Chinese firework factory going up!! Now I thought these were 18650 cells in Tesla cars?? Correct me if im wrong and everybody says how safe they are compared to lipos etc ...and no doubt they are..i have seen lipo fires and not good....but I have never seen lipos shooting up in the air like rockets and bouncing off the roof!! Anyway good to watch if anyone has any doubts about the dangers of batteries!!