Electric vehicles (EVs) are becoming increasingly popular, but potential buyers often have one significant concern: the longevity of the EV battery. Despite common misconceptions, battery degradation may not be as problematic as many believe. Recent data and surveys provide insights into how long these batteries last and what factors influence their lifespan.
In a 2025 survey, nearly 40% of respondents indicated they would be more inclined to purchase a used EV if it came with a battery health certificate. Over half of the participants expressed concerns about a battery’s lifespan compared to a traditional engine. The latest insights come from Aviloo’s 2026 study, which incorporated data from 500,000 EVs, including high-mileage vehicles, offering valuable information for prospective buyers.
Insights from Recent Studies
Contrary to earlier apprehensions, studies reveal that EV batteries often outlast initial expectations. ‘Usable’ capacity is a term frequently used, referring to the portion of the battery’s total capacity available for driving. Cars reserve some capacity to ensure optimal performance, as explained in detail here.
Research indicates that EVs typically lose 1–2% of their battery capacity annually. This degradation varies by model, battery type, and user habits. For instance, while many EV drivers avoid charging beyond 80% to maintain battery health, manufacturers like BYD recommend charging to 100% due to their battery chemistry.
Understanding Battery Longevity
Battery failures in electric vehicles are rare, with most issues covered under manufacturer warranties for up to eight years. Degradation is an expected aspect of EV ownership, but even as capacity decreases, cars remain functional. The state of health (SoH) of a battery, indicating the percentage of its original capacity that remains, is a key metric. For instance, a battery with 90% SoH retains 90% of its initial capacity, translating to a nominal range reduction in real-world terms.
Impact of Mileage on Battery Health
Aviloo’s findings, derived from thousands of battery tests, provide median SoH figures across various mileage intervals, such as 50,000 km, 100,000 km, and 150,000 km. Notable examples include:
50,000 km – 94.5% | 150,000 km – 90.3%
The Model Y showed a range decrease from 236 miles to 225 miles, with an 11% variation in range among tested vehicles.
50,000 km – 95.3% | 150,000 km – 90.6%
Its range dropped from 232 miles to 220 miles, with a 12% range spread observed.
50,000 km – 97.2% | 150,000 km – 92.8%
This model’s range decreased from 208 miles to 198 miles, with a 12% range variation noted.
50,000 km – 91.1% | 150,000 km – 86.3%
The Leaf experienced a range reduction from 122 miles to 115 miles, with a 13.5% spread due to its smaller battery size.
Top and Bottom Performers
Among the 150,000 km traveled vehicles, the Mercedes-Benz EQA, BMW i4, and Hyundai Ioniq 5 stood out with 93% median SoH figures. Conversely, smaller-batteried, older models like the Mini Cooper SE, Renault Zoe, and Nissan Leaf performed less favorably.
Additional Research Findings
Data from Aviloo, Recurrent, and Geotab provide further insights into EV battery performance. Recurrent’s study, covering one billion miles over five years, indicates a battery replacement rate of just 0.3% for models from 2022 onward. Geotab’s research emphasizes that rapid charging and extreme charge levels can accelerate degradation.
Factors Influencing Battery Degradation
Degradation is inevitable as EVs age and are used, but factors like temperature and charging habits play significant roles. Geotab suggests parking in shaded or indoor areas during heatwaves and avoiding prolonged high or low charge states. While rapid charging generates heat that can affect battery health, modern EVs manage this through software, moderating charging speeds to prevent damage.
Checking Used EV Battery Health
Potential buyers of used EVs can assess battery health through various means. Some vehicles display the battery’s SoH in their settings. Independent companies also offer battery health certifications. Additionally, experts advocate for mandatory battery health certificates for secondhand EVs sold by dealerships to ensure buyer confidence.
Original Story at www.electrifying.com