A Geotab analysis of over 22,700 electric vehicles confirms modern batteries are robust, but degradation varies significantly. The average annual capacity loss is 2.3%, returning to levels seen in 2020. This likely reflects newer models and higher reliance on DC fast charging, which is the single largest stressor identified.

High-power DC fast charging (>100kW) accelerates wear dramatically. Vehicles using it frequently see degradation rates up to 3.0% per year, compared to 1.5% for those relying on slower charging. Hot climates also add a penalty, while frequent full charges show minimal impact unless the vehicle sits at extreme states of charge for long periods.

Fleet managers can extend battery life by favoring lower-power charging when possible. The data shows that multi-purpose vehicles, like vans, degrade faster (2.7%) than passenger cars (2.0%). Battery chemistry and thermal management systems also play key roles, with some established models stabilizing at just 1.4% annual loss after an initial drop-off.