So I have a few data points to share from an older Tesla. First of all calendar aging seems to be discounted by this theory. It basically says a well made Tesla battery before they started making the 3 and y battery’s will not be subject to calendar aging. Here is why, Tesla had their brand on the line in 2015 and there are numerous sources that will say the battery quality was the best that year. Don’t believe me? My car is 7 years old and has .04 degradation. Also I should say the mileage is the key factor per a Tessie representative. They said the battery life/ specifically degradation is based on recharging cycles. Therefore, the old owner of this car told me he did 60% a lot, therefore I know capacity charging is the most important element in degradation. All hail to 30-60% range charging ! PS this car was made in 11/2015 and has 1% degradation