FYI: A 2019 Tesla Model S with over 250,000 miles demonstrates that modern electric vehicle batteries hold up remarkably well, retaining significant efficiency and range over time.
How Does Battery Degradation Affect Modern EVs?
Battery degradation in electric vehicles is an unavoidable reality, yet it doesn’t requite an EV to be retired after just a few years. Advancements in battery technology have shown promise that the lifespan of modern EV batteries may indeed exceed that of the vehicle itself. But while data and statistics present one perspective, experiencing degradation firsthand offers another insight. With that in mind, a particular high-mileage Tesla provides an intriguing example.
The High-Mileage Tesla Experiment
Out of Spec Testing recently conducted a range test on a 2019 Tesla Model S that has surpassed 250,000 miles—reconfirming its roadworthiness despite such usage. This Model S was acquired second-hand for just $9,000, factoring in various incentives, which is strikingly cost-effective given its extensive mileage. Interestingly, it features its original battery pack, initially 75 kilowatt-hours with an EPA rating of 285 miles.
Warranty and Range Test Conditions
Interestingly, this pre-2020 Model S still benefits from Tesla’s eight-year, unlimited-mile battery warranty for larger battery packs, offering two more years of coverage. This gives prospective buyers more confidence despite the car’s age and mileage.
During the range test, the car was charged to full capacity. The team optimized conditions by setting tire pressure to recommended levels, lowering suspension, and setting the climate control between 68 and 72 degrees. Notably, the older Model S has a Range Mode feature, no longer available in newer models, which temporarily made the vehicle front-wheel drive to conserve energy.
Test Results and Efficiency
Under ambient temperatures between 43 to 62 degrees with winds of 20 mph, the Tesla maintained a GPS speed of 70 mph. The test concluded when the vehicle reached 206 miles before it could no longer accelerate past 67 mph. Eventually, after restraint to slower paces, it alerted the driver to stop safely. The vehicle consumed 57.8 kWh in total, achieving about 3.6 miles per kWh. In comparison, a newer 2023 Tesla Model 3 Long Range averages 3.9 miles per kWh under similar testing.
The Battery Degradation Conclusion
While the observed battery degradation post-250,000 miles was approximately 23%, pinpointing the exact degradation is elusive since no baseline test was documented when the Tesla was new. Nonetheless, retaining a substantial degree of its original capacity is an impressive feat.
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William Kouch explains that the longevity seen in this Tesla Model S reiterates the point that modern EV batteries are engineered for endurance. As we continue to scrutinize and stretch the limits of new vehicular technologies, invaluable data like this helps shape future developments—solidifying the promise that electric vehicles are here to stay.
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