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I guess people didn't care.

http://fortune.com/2015/06/10/teslas-battery-swap-is-dead/

You're mistaken, Tesla's batteries are swapable. In less time than it takes to fill up a tank of gas.

Two issues, I think:

- Building out these charging stations. That's a huge capital outlay for anyone.

- Standardizing batteries, tough when they're in a rapid development phase both in chemistry and form factor.

The batteries are huge and expensive. You and the company would have to be comfortable swapping 5-10k dollar parts. You'd probably have to do that on a leasing model.

And you'd need something bigger than a gas station and way bigger than a charging station. And they would need to be everywhere to have value. Nobody wants to drive miles out of their way to swap.

https://en.m.wikipedia.org/wiki/Better_Place