The next big battery breakthrough is going to be a very mixed 'blessing'. On one hand much cleaner transportation will be a reality and OTOH drones and probably even insect sized spy devices will be everywhere. Spy vs Spy made real like in Mad magazine--but you are one of the spies just trying to live a somewhat free life. I predict in the next 10 years a Frank Herbert inspired 'hunter seeker' assassination autonomous mini drone will be deployed. Won't that be fun?