Both pairs were charged twice a day.Īfter all four test cars had been driven for 80,467 kilometers, the Level 2 vehicles had lost around 23% of their original battery capacity, while the Level 3 cars were down by around 27%. The first pair was charged with Level 2 chargers, and the second pair with Level 3 fast chargers. The INL tested two pairs of the 2012 Nissan Leaf under the exact same conditions over the course of a year, in Phoenix, Arizona. The US Energy Department lab concluded that while an electric car’s battery will deteriorate faster if its only power source is Level 3 charging (which is almost never the case), the difference isn’t particularly pronounced. The Idaho National Laboratory (INL) has made similar findings.
We can observe, however, that the difference between Level 2 and Level 3 isn’t that big: approximately 0.1%. What’s more, both Level 1 and Level 2 charging damage the battery less than the frequent use of DC chargers. It’s evident that Level 2 charging has the least negative impact, reaching 0.9%. The graph below compares how Level 1 and Level 2 (AC) chargers affect the battery’s state of health: Credit: Geotab Battery degradation for vehicles that primarily charge on Level 1 compared with Level 2. Credit: Geotab The more frequent the use of DC fast charging, the higher the battery degradation.īattery degradation appears to be strongly correlated with the use of DC chargers for vehicles in seasonal or hot climates.Ĭompared to EVs that don’t use fast charging at all, vehicles that primarily do use it show a battery deterioration by nearly 0.1%. The telematics company specifically examined EVs operating in hot weather conditions that have proven to be more straining for the battery. Studies reveal there is indeed a noticeable deterioration rate.Īccording to Geotab, for instance, the battery’s state of health (SOH) is affected by how often a vehicle is using DC fast charging.
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