Tesla’s own test showed 88% battery health after just 18 months and 13,162 miles.
The Model Y displayed 302 miles at full charge, down 36 miles from when it was new.
DC charging and parked energy use may be factors, but mileage alone doesn’t explain the loss.
Dissecting electric vehicle battery degradation tests is never boring or predictable. While there are patterns you start to see after poring over dozens of these pack health tests, there are occasional outliers that. Sometimes, high-mileage EVs have a lot more capacity left than you’d think, while others appear to exhibit accelerated degradation and range loss.
This new and low-mileage 2025 Tesla Model Y Long Range Rear-Wheel Drive falls into the second category. YouTuber Branden Flasch ran Tesla’s built-in battery health test on his own 18-month-old Model Y. The car had just 13,162 miles on it, so this is not some battered high-mileage EV with a hard life behind it.
