While we're imagining...
One thing we do know is that the battery swappers can be installed in a matter of hours. So it must not be some sort of elaborate robot. (Based on the fact that the biggest infrastructure so far in Hawthorne is in support of camera equipment.)
However... I think there is more to this tweet:
"Battery pack swap works with all Tesla Model S cars, past and present. It was always there."
That statement seems to be too obvious to be useful. It's unnecessary. It's like saying: "Tire rotation works with all Tesla Model S cars, past and present. It was always there."
Yes, it's technically true... but doesn't really seem worthy of a tweet. We already know (at this point) that the car support battery swapping. With an obvious interpretation of battery swap, it's obvious that all cars thus support battery swapping. Why would that even be a question in someone's mind? He didn't say: "We will offer battery swaps for all Model S's" (answering the question to 60's and 40's as per the level of service). He said it will work. But then - what makes this an open technical question? It's obviously the same form factor pack bolted onto the same frame on all cars. If it works for one offering, it works for all.
However, what if the car is actively involved in the swap? What if the car has hardware to assist in the swap? NOW only do you need an answer to the question of "which cars?".
So if you buy that's it's reasonable to assume that the car has some sort of swapping hardware, let's see if we can take that a bit further:
What if there are NO actual swappers?
What if the swap is completely performed by the Model S, and can do so from a stationary battery? (i.e. the batteries aren't just bolted unto the frame like we're assuming - it's actually bolted unto a small swapper assembly).
Then what you have at Swapper stations isn't really swappers so much as just a conveyer system to store & place the batteries in the Teslabelisk for charging.
Ok, you say, it saves a bit of money for the swapper network, but it makes the car more expensive for everyone. Why would you do that?
Well... I'm glad you asked! Because doing that enables a mind-blowing scenario:
* Two Model S's meet up one night in a dimly lit parking lot. One is full, the other empty.
* They both lower their batteries onto the parking lot floor.
* They drive over each other's battery, supported by an ILS-like navigation system on the 17" screen.
* The raise the other battery.
Still... you say, that's cool and all, but the scenario seems thin. So I can swap with a friend, but I'm a computer geek, and I have no friends.
Aha! (I say). Here's the kicker...
Support this by a social media app to connect swappers with swap-donors, complete with voting and geo-location, and push the $30 or so that the swappers would generally pay for a swap at a swap station over to the donors instead.
That would mean Tesla just got itself a network with up to 13'000 potential swapping points, growing by the day... for free.
How cool would that be?