General question, but theoretically if you were to get your battery replaced as well as the drive unit replaced, isn't this essentially the same as getting a new car within the same shell? I'm just thinking about longevity of the S, and this seems like a huge benefit if you want to keep the same car for a very long time. Of course, the rest of the car will undergo wear and tear and age, but wouldn't this be analogous to ICE cars getting a brand new engine (which obviously isn't really feasible/practical and no one does it)? Not sure what the out-of-warranty cost on both replacements would be farther down the line though...