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Interesting, I tried to do the same for model 2018 model 3 before a road trip a couple of months ago. They said mine was not compatible with it. What year is your model 3?
2018 Model 3 here with 132k miles on the odometer. I'm on my 4th year, I haven't changed my 12 volt battery yet. What do you think you're accomplishing by changing it before the car calls for it?