jm 'öKíÙ°:°suº83ZXe¯$COÂ^¿âL¦Elon has already stated many times it's coming as a choice but right now the only sane reason for a battery swap is if the battery fails which is covered by warranty.
https://whatsonchain.com/tx/d09eacff298bea6a87447311041b93150c8a36d2d5ec5cdcb9c69f2993f25b9f