Electric will solve so many problems. Installing charging points is cheap and requires little complication and regulation. Petrol/Jet A! installations are complicated, costly and subject to a lot of expensive regulation. Electric charging allows several charging points to be installed for plug in and walk away, at every parking stand if you wish. Hydrocarbon fuels stations are limiting so often means time consuming ques and aircraft repositioning otherwise or long waits for the bowser.
Electric engines give a high torque which is perfect for propellers and are low in maintenance. Fuel is the largest part of the current operating cost and comes with a high weight penalty. Batteries will come with low cost, enormous benefits both in mass and endurance. The technology is rapidly developing because its in the interest of all vehicles and machinery and is spurred on by the worldwide environment concerns. Shouldn't be too long before battery power is the norm for our aeroplanes.