[mr_overalls]

Although Tesla abandoned the idea because of lack of interest (which I do find strange), a swapping station solves this problem. A depleted battery can be swapped for a fresh one in less time than a gasoline fillup requires.

[felipelemos]

Tesla uses the battery as a structural part of the chassis. A swappable battery simply would not be possible.

[jandrese]

Not with the current design, but it's not hard to imagine a design that makes it possible.