But day to day driving is far inside the boundaries of any range issues. Swappable would inevitably imply something that's essentially a switch to rented, becau

But day to day driving is far inside the boundaries of any range issues. Swappable would inevitably imply something that's essentially a switch to rented, because battery wear cannot be ignored. The best way would be some rentable range extender battery (one-way, so that you can swap them like horses). With that available, affordable short range cars would suddenly become an attractive reality. I guess the most universal interface for this would be some kind of trailer. Or perhaps even some semi-autonomous companion battery that follows in the slipstream under it's own power but on a non-tensioned reverse umbilical? Just brainstorming about ways in which modern technology could help making the add-on battery painless.