Battery Degradation and Charging Speed Loss in a 2022 Tesla Model Y After Extensive Use

Germany's leading automotive association, ADAC, conducted an in-depth analysis of a 2022 Tesla Model Y's battery health after it accumulated approximately 87,000 miles (140,000 kilometers). This comprehensive test goes beyond typical owner observations, offering a detailed look into how extensive usage affects an electric vehicle's performance. The Model Y, a regular in ADAC's fleet since late 2022, is frequently utilized for extended journeys, demonstrating its reliability and endurance even under demanding conditions. Despite its consistent performance, the vehicle’s battery pack showed noticeable signs of wear.
The assessment revealed a substantial reduction in both battery capacity and charging speed. Initially, at around 62,000 miles (100,000 kilometers), the battery retained 91% to 92% of its original capacity. However, a subsequent test showed a further decline to 86% of its original capacity, indicating a total degradation of approximately 14%. This decline is consistent with similar observations for Model Y vehicles of comparable age and mileage. Furthermore, the Model Y's peak charging power, which was originally recorded at 257 kilowatts when new, has now dropped to just over 200 kW. This reduction translates to a 13% decrease in the amount of energy the vehicle can receive in a 30-minute fast-charging session, impacting its ability to quickly replenish its range. Previously, it could add 55.7 kWh in 30 minutes, now it adds 48.4 kWh, affecting travel distance by about 39 kilometers (24 miles).
While the capacity loss aligns with expectations for high-mileage EVs, the documented decrease in peak charging power provides crucial data for electric vehicle owners. This study highlights the importance of understanding not only battery capacity degradation but also how an aging battery influences charging performance. The findings underscore the need for continuous research and development in battery technology to enhance longevity and maintain charging efficiency over an EV's lifespan. Such detailed reports help consumers make informed decisions about electric vehicle ownership and usage, promoting a more sustainable automotive future.