I actually read through their results which came out well after what you quoted that I posted about 2 months earlier. That was from Recurrent auto and not Tesla. They had no data on S or X's and only 3/Y's. While it may apply, there have been a lot more S/X's around than 3/Y's but the limitation may be that Recurrent hasn't be monitoring cars that long.
They still point out circumstances where supercharging can be bad. Not to mention that dodge answering some of their own questions. Take a look at this one from their page of the results. Look under DC charging fact or fiction section. "Routinely fast charging your car from 0-100% is fine." Even in their own table, they somewhat answer counter to what the say their results demonstrate.
Under fiction they say "Any amount of fast charging will cause permanent damage to your battery." Under the fact part they say "It’s still difficult to quantify precisely how much routine fast charging affects battery health long term – 5, 10, 20 years – but it’s fine in small doses." So by their own admission, the jury is still out on the impact of DC charging.
FYI - I do use Recurrent Auto to monitor the battery health of my cars. So in general I have some faith in them. At the same time, they don't even get simple things right so I'd like to see the full methodology of their study and data and infer my own conclusions as I have a lot of questions about their results and think it needs more info such as incorporating geographic data to drive better insights.
As to where they miss simple things, which concerns me when they offer their degradation insights, there is a major issue with my S info. They told me on my car that I was suffering about 14% degradation on a car that is about 18 months old and <10k miles. Imagine my shock at how much degradation I supposedly had already experienced. So I started drilling down into the info. I found a major flaw. They said based on my cars data, I had an expected current range of 341 miles. Let me do the math, 341/346 = .979 or about a 2.1% amount of degradation.
They were calculating my degradation based on a factory wheel size of 19", not my 21's. If I had been running 19's, then their math might have been right. Instead they were off over 10%. They had now way to account for my wheel size such as a config file. So tell me how accurate do you think their results are going to be if they missed something simple like wheel size? I wrote them about not having the info right for my car and basically I got a shrug and was told they had no way of doing it for my S. I didn't inquire about my 3.
Maybe they got it right for every 3 and Y. Just to recap they were off regarding my estimated range by almost 12%! So what did the miss in the study? Or by some luck, or better data accounting for wheel size and temps, they get it right? I don't know about you, but I am not about to make my charging decisions based on that study. I can say my MS LR had virtually no SC use and had less than 1% degradation (or 0, depending on what method I used) when I sold it. My MS Plaid has about 2-2.5% using the same app/sources to measure degradation. My Plaid saw a lot more super charger use and this is pulling the data at the equivalent miles that I sold my MS LR. The climate was similar for both cars. I am pretty sure my MS LR had a lot more full-throttle runs than the Plaid did. I probably did full-throttle 150-200 test runs with that car.
Looking at it logically, if my approach is right, minimize SC use, keeping average SoC around 50%, then I will minimize the degradation of the battery. If I am wrong, I've lost nothing. I've been doing the same with my M3 LR w/boost and 18 months in I still have basically negligible degradation, almost all sources say 1 mile or less.. Using Recurrent it says my current rated range is 357 vs the original of 358. At my current rate of degradation, they expect it to still have a rated range of about 345 in 3 years which works out to total degradation of about 3% for about 4.5 years of ownership. I sure hope they are right. I plan on keeping the Plaid and 3 for as long as I can.
www.recurrentauto.com
