What I think has to be understood also is that what you gain in capacity, you also gain in weight. Even though there are batteries coming out that are lith-ion which have a lighter weight, not many people can afford them. People are going to find a happy medium where they get the speed and length(time) and weight mix. maybe with the rules on the weight of the cars, and chassis' becoming lighter, a little extra weight in the batteries may not be so bad