New analysis from Geotab suggests EV battery performance remains robust, even as fleets increasingly rely on rapid charging and higher vehicle utilisation.
Drawing on real-world telematics data from more than 22,700 EVs across 21 models, Geotab’s updated battery health study found average annual battery degradation now sits at 2.3% per year, up slightly from 1.8% in 2024. The shift reflects how EVs are being used, rather than weaknesses in battery technology.
Charging behaviour emerged as the most influential factor. Vehicles frequently using DC fast charging above 100kW showed degradation rates of up to 3.0% per year, roughly double those primarily charged using AC or lower-power DC charging. Even so, the data indicates most batteries still outlast typical fleet replacement cycles.
Higher daily mileage also increased degradation, but only modestly, rising by around 0.8% per year, a trade-off Geotab says is often offset by productivity gains and lower cost per mile.
The findings suggest fleets don’t need rigid charging rules, but can protect long-term battery health by balancing charging speed with operational need—keeping EV adoption both practical and commercially sound.
Read Geotab’s full EV Battery Health Report for deeper fleet charging and lifecycle insights.