determine if the drone can take off within a set up faraday cage. if so, then there are signals going to the drones to disable them. it is incredibly unlikely that the batteries are actually being "drained," and more likely that the drone's software is being manipulated to report such failures via hacking. if the batteries are truly being rapidly depleted of energy, then physics is being manipulated in novels ways. such rapid depletion of energy from a battery would traditionally be seen as a small explosive.
United States