A very few things are more retarded than electric flight.
Storing electricity is still an unsolved, serious problem. Energy density per pound ratio is ugly at best, and batteries output degrade with temperature, usage scenario, and other factors (while your combustion engine can get 100% power until the last drop of propellant).
What if your engines lose power during a flight?
(also, their weight will be the same until landing)
Batteries will eventually get better. Say, 10%, 20%, 30% more. May be the discharge curve will be flattened. Maybe they will perform better below 0°F or above 100°F.
But they won't ever be able to make electric flight comparable to normal flight.
Yes, I know, some sci-fi revolution about storing electric energy in small, light packages, could change that. Until then, electric flight will be either for toys, or a meme.