EV batteries have a limited and unpredictable lifespan — degrading quickly and leaving drivers with a vehicle that has substantially reduced range well before the end of what they would expect to be the vehicle's useful life.
The concern about battery lifespan is understandable given the experience many people have had with smartphone and laptop batteries, which visibly and rapidly degrade. An EV battery pack, however, operates under entirely different conditions: it is thermally managed, partially charged and discharged rather than fully cycled, and designed to deliver at least a decade of automotive service.
Real-world data tells a reassuring story. Geotab's study of over 22,700 EVs found an average annual degradation rate of 2.3% — meaning a battery retains on average more than 81% of its original capacity after eight years. Most batteries with over 200,000 km show between 88% and 95% of their original capacity.
Stanford University research published in December 2024 found that real-world EV batteries last up to 40% longer than laboratory tests predict, because the variable, stop-and-start nature of actual driving is gentler on battery chemistry than steady discharge cycles. Most automakers back their batteries with 8-year, 160,000 km warranties guaranteeing minimum capacity retention, and many batteries are expected to remain functional well into a second decade of use.