New Study Reveals Surprising Durability of EV Batteries: Hyundai Ioniq 5 Leads the Pack
A groundbreaking study analyzing the health of 500,000 electric vehicle batteries over five years has offered reassuring insights into their durability. The comprehensive research, undertaken by the EV battery diagnostics firm Aviloo, assessed 20 prominent electric car models across North America, South America, Europe, Asia, and Australia. The findings largely dispel concerns about rapid battery degradation, revealing that the majority of EV batteries maintain a significant portion of their original capacity, even after accumulating tens of thousands of miles. This extensive data confirms that electric vehicles are a robust long-term investment, though individual vehicle choice and usage patterns can notably influence battery longevity.
Aviloo's evaluation focused on the 'state-of-health' (SOH) scores, which represent the percentage of a battery's initial usable capacity that remains. A higher SOH directly correlates with a greater retained driving range. The study tracked median SOH scores at key mileage intervals: 50,000 kilometers (approximately 31,068 miles), 100,000 kilometers (approximately 62,137 miles), and 150,000 kilometers (approximately 93,205 miles). This systematic approach allowed for a clear comparison of how different EV models performed over time and distance.
At the 50,000 km mark, the Hyundai Ioniq 5 emerged as the leading performer, retaining over 97% of its battery capacity, effectively performing like a new vehicle in terms of range. Following closely was the Mercedes-Benz EQA, which maintained 96.56% of its capacity. Notably, almost all 20 models in the study recorded median SOH scores above 90%. Exceptions included smaller EVs like the Renault Zoe and Nissan Leaf, which utilize air-cooled batteries. Aviloo's analysis suggested that smaller battery capacities in these models necessitate more frequent charging cycles to cover the same distances, contributing to accelerated degradation.
The trend of impressive battery retention continued at the 100,000 km milestone, where the Hyundai Ioniq 5 once again secured the top position, exceeding 95% remaining capacity. Other strong contenders at this stage included the Mercedes-Benz EQA (95%), Hyundai Kona Electric (94.3%), BMW i4 (94.3%), and Ford Mustang Mach-E (93.45%). Excluding the aforementioned outliers, all models maintained at least a 90% median health score, underscoring the overall resilience of modern EV battery technology.
By the 150,000 km mark, most EV models showed median battery capacities ranging from 90% to 94%. The smaller Mini Cooper SE (87.11%), Leaf (86.67%), and Zoe (87.33%) exhibited lower retention rates. The Ioniq 5 and EQA remained at the forefront, with 93.79% and 93.97% capacity, respectively. The BMW i4 (93.62%), Kona EV (92.95%), and Volvo XC40 Recharge (92.79%) also demonstrated excellent long-term performance. Interestingly, Tesla's Model Y and Model 3, while respectable, fell into the mid-to-lower range of the group, with the Model Y at 90.3% and the Model 3 at 88.94% after 150,000 km. The Hyundai Ioniq 5 consistently stood out as a leader in battery longevity across various mileage points.
While the study generally paints a positive picture for EV battery longevity, it also highlighted the significant variability in outcomes. For instance, a Model Y after 150,000 km could retain anywhere from 82.9% to 94.9% of its capacity, and a Model 3 between 80.28% and 94.53%. Factors such as warmer climates, frequent use of fast charging, and regularly maintaining a 100% charge for extended periods can accelerate degradation. Additionally, different battery chemistries employed by manufacturers play a crucial role in how batteries age. Calendar age also contributes to battery wear. These variables emphasize that while EV batteries are generally robust, owner practices and environmental conditions can significantly impact their performance over time. This research provides valuable insights for both current and prospective EV owners, indicating that a 10% range reduction after 100,000 miles is a reasonable expectation, though individual experiences may vary.