Could we think of it a different way?
Instead of charging the batteries in your car, why don't we have stations that have banks of batteries so you can swap out your batteries for new ones? They can sit charging at the station.
There are some problems with this... you'd need a universal battery standard, and what happens when there are no "full" batteries? People tend to already "rent" the batteries from the manufacturers, so as long as you get a guaranteed quality and range it might work?
Q: Shouldn't they be comparing number of charging stations to petrol pumps, and not stations?