Tesla Model 3 and Model Y Battery Degradation After 100,000 Miles




A recent comprehensive study into electric vehicle battery performance indicates that while modern EV power sources are generally robust over time, not all models perform equally. Notably, the Tesla Model 3 and Model Y, popular choices in the EV market, showed moderate battery degradation after significant mileage, placing them behind some rivals.
Detailed Report on EV Battery Longevity
On a Wednesday in September, Aviloo, an Austrian company specializing in battery diagnostics, unveiled the findings of an extensive research project. This study encompassed data from 500,000 EV battery tests conducted globally since 2022, focusing on the battery health of 20 prominent EV models. The analysis tracked the median battery health at key mileage milestones: approximately 31,000 miles (50,000 km), 62,000 miles (100,000 km), and 93,000 miles (150,000 km). Battery health was quantified by the percentage of the original usable capacity remaining.
The study's results positioned the Tesla Model Y with a median battery health of 90.32% after 93,000 miles, translating to an approximate reduction of 30 miles in its EPA-rated range. The Tesla Model 3 exhibited slightly less favorable performance, with its median battery health at 88.94% at the same mileage. In comparison, vehicles like the Hyundai Ioniq 5 maintained 93.79% of its capacity, and the Ford Mustang Mach-E retained 92.53%.
It was observed that Tesla models, particularly the Model 3, experienced a more pronounced initial drop in battery capacity. The Model 3 saw a 6% decrease in range during its first 31,000 miles. However, the rate of degradation significantly slowed thereafter, with only an additional 3% loss between 31,000 and 62,000 miles, and another 3% in the subsequent 31,000 miles. This decelerated degradation aligns with broader research findings on EV battery aging curves.
While the median figures provide a general overview, Aviloo stressed the importance of considering the full spectrum of possible outcomes for individual vehicles. The study revealed a considerable range in battery health within the same models, with some Model 3s retaining as little as 80.28% and Model Ys as low as 82.90% after 93,000 miles. Conversely, some units performed exceptionally well, achieving up to 94.53% for the Model 3 and 94.94% for the Model Y. These variations are often linked to factors such as driving habits, charging routines (frequent 100% charging can accelerate degradation), and environmental conditions, particularly extreme temperatures like those found in the American Southwest.
This study provides valuable insights for prospective used EV buyers, emphasizing that a vehicle's history, including its usage and climate exposure, plays a crucial role in its long-term battery health. While a 10% range reduction might serve as a general guideline for Teslas approaching 100,000 miles, individual outcomes can differ greatly based on these influencing factors.
This comprehensive report by Aviloo offers vital information for both current EV owners and those considering purchasing a used electric vehicle. The detailed analysis of battery longevity across various models, including the popular Tesla Model 3 and Model Y, underscores the importance of understanding real-world battery degradation. It serves as a reminder that while the median performance can be a useful indicator, individual battery health can vary significantly based on how the vehicle is used and maintained. This data empowers consumers to make more informed decisions about the long-term value and performance expectations of their EV investments.