Re: OFFICIAL: New 991.2 GT3
I am not sure why your are not understanding this but apparently the Teslas were designed to have a replacable battery pack and Tesla said they would provide them. The only unknown was the cost of replacement in such a distant future (at the time 8 to 10 years). Replacement is pretty easy to do, Tesla have developed special machines to do so.
https://m.youtube.com/watch?v=H5V0vL3nnHY
Musk has thought about many many things from the beginning that people are just thinking about now. That's where the genius was when they designed the car from the get go.