Data shared by Model S owners shows battery degradation could stay within the 90 percent mark through 200,000 miles driven.

A group of Tesla owners on the Dutch-Belgium Tesla Forum are gathering data from 286 Tesla Model S owners across the world. It’s frequently being updated in a public Google file that you can view here.

The shared data is showing that most of these Model S owners are experiencing loss of about 5 percent battery capacity in the first 50,000 miles driven. Degradation is slowing down after 50,000 miles and it may take well over 100,000 miles of driving to see an additional five percent in degradation.

The trend line coming from Dutch-Belgium Tesla Forum members suggests that the average battery pack could go another 150,000 miles (200,000 miles total) before coming close to 90-percent capacity.

Electrek studied the data, including a few outliers, and found what it considered to be consistent patterns for these Tesla owners. Reaching a 90-percent charge level appears to be the ideal daily charge; and, surprisingly, frequent Supercharging, from daily to twice a week, may actually be beneficial in preventing battery degradation.

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As cited by Electrek, CEO Elon Musk once referred to a battery pack Tesla was testing in a lab with a simulated 500,000 miles driven. Musk said that the battery pack was still operating at over 80 percent of its original capacity.

Electrek takes it much farther, suggesting that 500,000 now looks more reasonable to expect, and a one million-mile battery pack should be next.

Keeping speculation to a minimum, what can be said is durability is looking good so far on Model S battery packs, but the 500,000 to one million-mile marks are unproven at this point.

The Model S was launched in the summer of 2012 – a little over four years ago. Going 20,000 miles per year, which would be well over the national annual mileage average, means that many Model S owners are still under 100,000 miles driven.