> There's at least a factor of 50 available between today's batteries and the energy density of gasoline (for example). That difference doesn't imply that batt

> There's at least a factor of 50 available between today's batteries and the energy density of gasoline (for example). That difference doesn't imply that batteries can be improved at all, let alone by 50x. There are lots of differences between batteries and gasoline and some of them may limit the energy density of batteries to be less than that of gasoline. Even small differences matter. For example, diesel has significantly more energy per volume than gasoline. (I forget how the various alcohols rank.)