EV batteries are essential infrastructure

Electric vehicle batteries appear to be holding up far better than many predicted, says Generational

Electric vehicle battery condition transparency is becoming essential infrastructure, claims a new report from Generational.

The white paper aims to support decision making across the industry, across policy-making, valuation, underwriting, warranty design, fleet management and remarketing. 

Generational is a UK-based innovator in electric vehicle battery testing solutions. Its mission is to support a healthy used EV market by creating transparency into battery condition – helping businesses trade more effectively and helping buyers choose a used EV with confidence.

Generational 2025 Battery Performance Index is the UK’s largest analysis of EV battery condition conducted to date, based on battery health assessments conducted in 2025 across BEVs and PHEVs, passenger cars and LCVs, spanning 0 – 12 years and 0 – 160,000+ miles. 

The analysis by Generational covered 8,000 electric cars from 36 different brands. It covered everything from new vehicles to used cars up to 12 years old and mileages from zero to over 160,000 miles.  

Across the entire sample, researchers found an average battery state of health (SoH) of 95%, which is significantly higher than the 70% threshold that typically triggers a warranty replacement. 

Example findings from the 2025 data:

• Average battery health: 95.15% across all vehicles tested. 
• Even 8–9-year-old vehicles show ~85% median capacity, comfortably above common OEM warranty thresholds (typically 70% SoH). 
• Mileage alone is not a reliable predictor: vehicles with 100,000+ miles often return 88–95% battery health.

Electric vehicle batteries appear to be holding up far better than many predicted. Even the oldest vehicles in the study, those between eight and 12 years old, performed strongly. Their median battery health sat at 85%, with the lower quartile averaging 82%. Meanwhile, the best-cared-for cars in this age bracket were still operating at around 90% of their original capacity. 

High-mileage vehicles (100,000+ miles) showed results between 88% and 95% battery health, highlighting that mileage alone is not a reliable predictor of battery condition. 

Oliver Phillpott, chief executive of Generational, said: “The Generational Battery Performance Index definitively shows that EV batteries are performing far better than many consumers and industry stakeholders have been led to believe. With an average state of health of over 95%, and even older vehicles comfortably exceeding warranty thresholds, the underlying fundamentals are extremely strong.

“Transparency in battery condition is the main challenge facing the market today, and essential infrastructure for a healthy used EV sector; as vehicles age, the variance between the best and worst performers widens, and that dispersion defines risk. By establishing clear benchmarks for what is typical, above and below average as we look to drive further growth in 2026, we are giving the market the reference points it needs to price risk accurately, strengthen residual values and accelerate adoption.”