EV Battery Health: New Data Shows Longevity Exceeding Expectations

Recent analysis of electric vehicle (EV) battery performance is challenging previous concerns about rapid degradation and limited lifespan. A comprehensive study by Generational, a UK-based innovator in EV battery diagnostics, reveals that EV batteries are proving more robust and reliable than initially predicted, often outlasting the vehicle itself. This finding addresses a key barrier to EV adoption – consumer anxiety surrounding battery health and longevity.

The Generational Battery Performance Index

Generational’s 2025 Battery Performance Index, the largest analysis of EV battery condition undertaken in the UK to date, examined over 8,000 passenger cars and light commercial vehicles. The study encompassed 36 manufacturers, with vehicle ages ranging up to 12 years and mileages exceeding 160,000 miles. TechRadar reports the average battery State of Health (SoH) across all vehicles tested was 95.15% of original capacity.

Key Findings on Battery Degradation

• Older Vehicles Retain Capacity: Even eight- to nine-year-old EVs retained a median battery capacity of 85%.
• High Mileage Doesn’t Equal Rapid Degradation: Vehicles with over 100,000 miles frequently showed a SoH between 88-95%.
• Warranty Performance: Vehicles often meet manufacturer warranty conditions even after the warranty period expires. For example, Škoda guarantees its Enyaq and Elroq batteries will retain at least 70% capacity for eight years or 160,000 kilometers.

Implications for the Used EV Market

The study suggests that concerns about battery health are often overstated, potentially hindering the growth of the used EV market. Philip Notard from the Vehicle Remarketing Association (VRA) emphasizes the importance of battery condition for potential buyers, stating they want assurance the battery will meet their needs. Generational highlights that transparency regarding battery health can increase buyer confidence and boost sales.

Second Life Potential

Even batteries that have degraded below typical warranty thresholds still hold significant value. Generational notes that these batteries are often suitable for “second life” applications, such as stationary energy storage. This extends the economic viability of EV batteries and contributes to a more sustainable energy ecosystem.

The Role of Standardization and Transparency

The analysis points to a need for standardized battery health assessments and greater transparency in the used EV market. Currently, uncertainty about battery condition can lead to lower prices and slower adoption rates. The report recommends attaching standardized battery condition reports to every used EV, similar to how AAA Auto in the Czech Republic currently displays battery condition in its online listings. GB News reports that incentives can also distort the market, reducing residual values.

Industry Recognition

Generational’s operate has received industry recognition, including a Car Dealer Power Award for Product Innovation of the Year. Generational has also secured backing from the Advanced Propulsion Centre and the UK Government through innovation investment.

Key Takeaways

• EV batteries are proving more durable than previously anticipated.
• High mileage does not necessarily equate to significant battery degradation.
• Transparency in battery health reporting is crucial for building consumer confidence in the used EV market.
• Batteries that have reached the end of their life in vehicles can often be repurposed for energy storage.