As I said Crash - they're all solvable problems, just not overnight, and not necessarily in a way that permits a straight swap with the technologies we're flying at the moment, or at the same scale.
For example - a major issue may be unattended charging - if you rummage around YouTube you can find plenty of examples of people who seem to be determined to blow batteries up, and the most exciting seem to be where they've deliberately overcharged them. That's solvable too - but is a problem that just doesn't exist at-all with present technologies.
Another for-example. Train a new PPL on an all-electric, then they want to go and fly a Piper or Cessna conventional product. What differences training will then need in a new aeroplane that has a fuel system instead of an electrical system, can change CG position with fuel/energy state, and requires familiarity with a mixture control and carb heat. Again, all solvable - but does need to be solved.
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Last edited by Genghis the Engineer; 16th Feb 2018 at 12:23.