Owners With Two Generations Of Same EV Model - Battery Degradation

AVILOO published more than 500,000 battery tests on September 2, run between 2022 and 2026 across 20 models and four continents. The most useful result is not the model ranking, it is the spread measured between individual cars of the same model: up to 13.5 points of state of health. On a Model Y at 150,000 km, the observed range runs from 82.9 % to 94.9 %. I have a concrete case to set beside that, with its limits stated. Two Model X, same owner, same climate, same split between fast charging and home charging, and according to the available sources the same cell format and chemistry (18650 NCA). The first was sold on the day the second was delivered, December 15, 2023, which makes it possible to compare them at the same age. At two years and nine months, the 2016 Model X had lost roughly 5 % of its range, with approximately 98,000 km on the odometer. The 2023, at the same age, shows 18 % with 73,000 km. Three and a half times the degradation, on 25,000 km less. A reader added a case pointing the same way under one of my posts, and the screenshot is attached. Christophe Bretaud has owned four Teslas since 2013, 560,000 km in total. The two that have covered the most distance are his first ones, and they are down only 4 to 6 %, while his 2024 Model X is already at 12 % in two years and 60,000 km. Twelve percent in two years is 6 % a year, against 6.5 % a year for my 2023. I do not know his measurement method and his 4 to 6 % is not on Model X, but the order of magnitude and the inversion are the same at a second owner's. One point deserves correcting, because I expected the opposite result. The 2016 was a 60D, a 75 kWh pack limited in software to 60, as Tesla announced on July 13, 2016. It therefore ran for twenty-two months at 80 % of its real capacity. I checked whether that period had protected it. Delivered January 11, 2017 and unlocked November 22, 2018 at 67,300 km, it lost 3.9 % while limited, about 2.1 % a year, then 5.7 % over the following five years, about 1.1 % a year. Degradation was twice as fast during the limited period, which matches the ordinary battery curve, steep at first and flatter later. The data does not support a protective effect. I draw no causal conclusion from two owners, displayed range is not laboratory state of health, and the 2016 values at two years and nine months are extrapolated from the November 22, 2018 reading. The observation still seems worth putting on the table, because none of the large published studies breaks its results down by charge rate, chemistry or climate. That is why I am looking for comparable cases. If you owned an older generation of a model and you now drive the recent version of that same model, Model X, Model S, Leaf, Bolt or another, I would like to hear from you: both your loss figures and both your odometer readings. Sources: AVILOO, September 2, 2026 · Tesla, July 13, 2016 · Automobile Propre. I post this kind of analysis a few times a week: https://lnkd.in/grXCqAH2