ok, I saw this 2 weeks ago at the track. A local sponsored guy puffed a pack on the track. After the race, he put it in an ammo can. About 10-15 minutes later we heard the boom and smoke. It almost sounded like a gun shot in that ammo can. Lots of fire and smoke. Keep in mine, they can start fire when non in use or charging. I get rid of puffed packs. Some guys say, "I have used puffed packs for year and its fine". Why risk it? Puffing is not a good thing and you have a kid using the model. I race offroad with my 8 year old, so I will never own a puffed pack.