Since Jim brought up the subject, a few words about “quick change batteries.”
First two words: Form Factor.
Third word: Weight.
Anything more than 30 pounds per module is a non-starter. Doubt me? Try hefting around a 5-gallon jug of gasoline.
More realistically, make it 15 pounds, so that 90-pound female flight instructors have a fighting chance at not herniating themselves when “re-fueling” the bird.
If the energy requirement calls for 600 pounds of state-of-the-art battery power, then we’re looking at 40 quick-change battery modules, at a minimum - more like 50 when you consider the weight premium of all of those blind-docking power connectors and the weight of the multiple plastic battery cases.
How long wili it take to swap out those 50 battery modules? If you could get it done at a rate of one per minute (doubtful), it would take almost an hour to “re-fuel” the “quick-change” bird.
Realism’s a bitch.