Surely it would be easier to recharge rather than swap batteries? I wonder if in the future war will be like a turn based strategy game as everyone wait for drones to recharge before making a move.
I don't see it working like that in Ukraine...
Difficulty for swapping batteries too - how to differentiate between strategic bombings and a refueling accident.
Mid-air: yes. A boom with a charging cable or even beamed energy would be much easier.
On the ground: swapping batteries is faster, and batteries are cheaper than planes or drones. You want the expensive part back in the air as soon as possible so you don't need as many of them. On the whole this probably also simplifies logistics: in civilian aviation airport space is limited, in wartime it's easier to transport one hundred drones and two hundred battery packs to the frontline than to transport two hundred drones