My car is in to the SC for Annual Maintenance as the PO had not performed it in a couple of years (the husband past away and the wife didn't know if she wanted to sell it). A couple of weeks ago my wife and I did a tour of the Gruber Motors shop in Phx. While I was there I purchased his 12V battery which he had created a different slide on cable attachments to the battery. He also provided new cables to make the transition from the bolted type connection (so common to batteries) to his slide on connection. Well the service tech informed me they can't install it as it is not factory. They make no exceptions to the rule I guess, now I get to get the car home take the wheel off, inner fender off and do the swap. Lesson learned do not expect Tesla to do any work that is not factory.