Actually my main concern is a LIPO battery in some portable device
Something the airlines are training for these days - extinguisher is a waste of time, needs dowsing with water (lemonade/coke etc works as well) some interesting videos out showing a laptop on fire, extinguished with water and then covered in ice - after a few minutes the battery reignites, what you have to do once extinguished is keep it immersed in water until all the heat has gone.