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EV Battery Life: Fast Charging Hurts More
27 Oct
Summary
- EV batteries retain 82% capacity after eight years on average.
- Frequent DC fast charging increases annual degradation rate.
- Hotter climates lead to a slightly faster battery degradation.
A recent study analyzing over 22,700 EVs indicates that electric vehicle batteries, while durable, are susceptible to degradation influenced by charging behaviors and ambient temperature. On average, EV batteries retain nearly 82 percent of their original storage capacity after eight years, with an annual degradation rate of approximately 2.3 percent.
The research highlights that frequent use of DC fast charging (DCFC) is a significant factor contributing to accelerated battery wear. EVs utilizing DCFC for 12 percent or more of their charging sessions showed a higher annual degradation rate compared to those using it less frequently. Charging at high power levels, over 100 kW, also contributes to faster capacity loss.
Temperature, particularly heat, also plays a role in battery health. EVs operating in hotter climates experienced a slightly faster degradation rate due to increased chemical activity within the battery cells. While battery degradation is an inevitable process, awareness of these factors can help owners mitigate damage and maximize their EV battery's lifespan.
