[timroman]

Who says you have to lease one physical battery. Perhaps the battery lease is "a" battery and not "your" battery and Tesla takes care of maintaining them all. And when new batteries come out, you can have the option of upgrading to those. In the future, the station could have three types of batteries for customers to choose from, just like gas.

Sounds like when I get my propane tank filled. They don't care what condition it is in. I get a freshly painted filled one every time. And if I want, I can pay for a bigger one.