Don't know the exact incident you're referring to...but most likely the tank's post passed through the top as part of the mod's design and made direct contact with the battery. That makes it very easy for the tank to short out against the battery. Constant dead short+Liion battery=BOOMYeah,I know,He had the wrong battery in it,The battery he had in it was to powerful for the mod. So I guess the coil exploded along with the tank..