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The answer to the question as stated - NO.Is fast charging your Model X at a Supercharger significantly worse for your battery?
It seems like my driving routes require me to Supercharge a few times per week, would this harm my battery?
Hi. There is no data to support the argument that supercharging more often is bad for the battery. The two charts below are from the MaxRange Tesla battery survey. The second chart with the blue dots shows remaining range versus mileage. Each dot represents an entry. Many users submit multiple entries. All of these are shown here. The red trendline shows the average user. Some entries are above the trendline, some are below.
The first chart shows what percentage of users are above the trendline. For example, 71 people said they supercharge twice a month. 41 of those are above the trendline. That's 57.75%. Therefore you see a bar that's 57.75% green. The longer the green bar, the higher the percentage of people who are doing better than the average user.
To make this as accurate as possible, the first chart considers only the last entry by each user. Otherwise, somebody who submits 20 entries would mess up the accuracy. Therefore only the last entry of each user counts. This was technically difficult to implement but I thought it was worth it.
Unfortunately, some options were selected by too few people, therefore the precision is negatively affected. For example, only 6 people said they supercharge once or twice a year. With so few people, a single person represents %16.67. That's not very precise. Therefore entries with fewer people should be considered less precise.
If you look at answers that were selected the most, those are option D, E and F. They show a slight advantage for supercharging more often. In other words, supercharging monthly seems to be slightly better than supercharging a few times a year and supercharging twice a month seems slightly better than supercharging monthly. However, then we have the supercharging weekly option which is 50%-50% but on the other hand, doesn't have as many entries.
Therefore it is a little difficult to say at this stage that supercharging more often is better for the battery, even though the trend points towards that direction. However, what I can say is that the data doesn't show that supercharging often is bad. In conclusion, I wouldn't worry about supercharging frequently.
As a side note, the 90 kWh battery might have some limitations (it could be related to cooling) and therefore supercharging the 90 kWh often might not be a great idea. There is anecdotal evidence that Tesla has implemented a supercharge counter into 90 kWh Model S/X cars where the peak power of supercharging is permanently reduced for the rest of the life of the car once it reaches 300 DC charging sessions (total 300 supercharge or chademo charge sessions). If somebody has a 90 kWh pack, they might want to check out this topic: If you fast charge, Tesla will permanently throttle charging
Source: MaxRange Battery Survey, Stats page, rows 14:24
Source: MaxRange Battery Survey, Charts page