A Jabiru, parked in a hangar, master switch off, battery hooked up to a smart charger. Without warning the aircraft catches fire and is totally destroyed. All aircraft are checked at the end of the flying day to be sure they are stowed properly. This aircraft had not flown for a few days. A look at the wiring diagram shows that the battery is pretty much isolated from the aircraft when the master switch is off. No fuel leaks around the plane. So, I'm suspecting either the battery caught alight (standard Jabiru battery fitted) because it was faulty or perhaps the smart charger cooked the battery. I would think being 'smart' that would not happen. Your thoughts....