When e-batteries catch fire while enroute somewhere in the cargo hold or container of a plane or ship ... are they hooked up to chargers? I imagine battery fires are caused by the failure of insulating components meant to keep high potential areas away from one another. I try not to forget, but every now and then I'll remember a 4x18650 battery pack left on the charger for two days. Good thing ALL my battery packs are mid-tier if not top of the line. My mid-drive battery 52V x 17ah cost over $500. I don't worry about it catching fire. I had to get off Endless Sphere because of all the 'bomb disposal' equipment posters were insisting I needed to charge my battery.