How to power an electric car.
The trouble is, this would require infrastructure, and no one wants to invest in infrastructure because no one wants to be on the losing end of a format war. This, to me, seems to be a legitimate government market-intervention. Get the industry representatives together, have them decide what kind of battery cars are going to have, and make it an industry-wide standard. Every car would run with the same battery--which would make it worthwhile to create battery stations around the country to change the battery. The infrastructure will be built piecemeal otherwise.
That's how you make an electric car and make it work.