Without the worry of running out of power…
Let consider some alternatives to drone delivery of batteries. Drone speed, 60 mph. Electric power speed the speed of light. Ubiquitous charging ports might be one way to eliminate worry of running out of power.
Placing a fast charge resource on tow trucks where a 10 minute transfer of power adds 100 mile range. The emergency delivery of power is accessed for free with AAA membership.
New battery technology in 2027 delivers 600 mile range and 200 mile charge in 5 minutes. Solid state or high density Si anodes or Li Sulfur all in production today, by 2027 second generation with improved performance and lower cost.
Having said that drones could make highway delivery of coffee fun.