A shorted battery with enough energy to fly something is able to start a fire. If you don't believe me, just short the battery and see what happens. BTW, abou

A shorted battery with enough energy to fly something is able to start a fire. If you don't believe me, just short the battery and see what happens. BTW, about 25 years ago I used to manufacture motor controllers for model airplanes and drones. Back then I bought almost every available motor controller in the market for testing. The final test was to short the output of the motor controller (simulating a potential reality of a crash). Every single controller in the market at the time went up in flames. In other words, in a crash there's some probability N of one of the M motor controllers on the drone shorting or the motor being prevented from spinning. Without safeguards (which is the case with most consumer products of this class and particularly true of cheap Chinese products) this means nearly 100% of the the energy in the battery will go towards heat generation, potentially culminating with ignition of anything from the battery to the motor and, eventually, any fuel in contact with the same. BTW, back 25 years ago my motor controllers were differentiated by addressing a number of these safety features, including short circuit protection, stalled motor protection and more. Every single motor controller shipped went through automated testing that included short circuiting the output, stalling a motor and more. Yes, LiPo's are nasty due to their chemistry, yet, at the end of the day, this is about converting the energy in a battery into heat, inside or outside the battery pack.