"Hydrogen is a flammable gas. However, hydrogen stored in a battery with a catalyst is not in a state where it is flammable."
I said before get yourself half a liter of Formic Acid and heat it up over 69° C. A drone with that fuel can not get close to heat sources.
" Meanwhile, using corrosive acid is certainly not a new thing last I checked. Are you perhaps arguing against the concept of batteries here?"
How useful is a flammable acid? . Is two dangers for the price of one.
"Meanwhile, use of drones in warfare has nothing to do with a new battery being developed."
Longer flying time by the cheap is the wet dream of any military nutcase.