Sxturbo has some of the current costs in a link on page 3. Right now it's a lot, in the future it might get down to the same level as replacing a turbo.This is what I'm referring to. As long as a combustion engine keeps chugging along with parts replaced here and there, the car stays on the road. Yes I appreciate these engines also have a finite life. However I wonder how cheap replacement batteries will be if they are beyond service/repair?