I believe that the answer, at this point, is that no one really knows. As others have mentioned, their are vehicles over 400,000 miles. 8/120k warranty.
In some of the earlier batteries, there were indeed some early mortality issues, but once you get pass that, the numbers just don't exist yet.
But, remember, that after the 8 years that the warranty lasts, the prices of batteries are going to be a lot less than they are today. Sp. for possibly a few thousand dollars, you mat get a new battery, which is like a new car.
So, therefore if you are trolling, go find something else to troll about.
If you are worrying, check this one off the list.
You missed the event in Chattanooga last week, head down to Atlanta this weekend
National Drive Electric Week Event - Atlanta
where you can get to see a bunch of cars and get your questions answered.
If you see a blue Model 3 and a red 2018 Leaf, drop by and say hello.