Where are you getting that I'd pay for labor to put in the 12 volt battery? Tesla would cover the 12 volt battery under the 4 year warranty including labor. But mine has not died yet. And granted Tesla sells the battery for I believe under $100 and I have no problem installing it myself, but that is just another expense I have to pay on a $66k car (not counting tax and registration or insurance), so I don't like being nickel and dimed, especially because a part has had known early failure issues. And yes, I had hoped that the extended warranty would have covered the 12 volt battery too, but it doesn't so that isn't a thing now. What is a thing is spending thousands of dollars to warranty something that may or may not fail. And, one thing to note is that extended warranty years of coverage aren't extra years on top of how long you've had the car, it includes the age of the car. So, my car is 4 years old and if I go the 6 year extended warranty, that would really only give me 2 extra years of coverage.