Electric vehicle owners often worry about battery degradation, but many are unaware of the typical rates of capacity loss over time. While there’s no one-size-fits-all formula, certain patterns emerge that can help drivers understand and anticipate battery performance.
The rate of degradation isn’t consistent; it’s usually more pronounced in the early years and slows down as the battery ages. This phenomenon is crucial for understanding the long-term value and reliability of electric vehicles.
Tesla Model Y: A Real-World Example
A Tesla Model Y with LFP batteries from CATL provides a compelling case study. This particular vehicle, owned by Tom Scheiter is a Standard Range model that’s three years old and has covered approximately 80,000 kilometers.
Tom purchased the SUV used, with 55,000 kilometers already on the odometer. An initial battery health test revealed that the battery retained 92% of its original 60 kWh capacity, indicating an 8% loss over two years. This rate of degradation is higher than average but not uncommon for batteries subjected to frequent fast charging.
The Impact of Fast Charging
The significant degradation in the early years is likely due to the vehicle’s charging habits. The Model Y was primarily charged using DC fast charging such as Tesla’s Supercharger network. LFP batteries are known to degrade faster with frequent fast charging compared to NMC batteries.
After an additional 25,000 kilometers and one year of use, a follow-up test showed the battery health at 91% representing only a 1% loss in capacity. This slower rate of degradation aligns with the typical pattern of battery aging, where the initial years see more significant losses.
Practical Advice for EV Owners
For those considering a used electric vehicle, it’s essential to test the battery’s health immediately upon purchase and conduct periodic follow-ups. This practice helps monitor the battery’s condition and ensures you’re making an informed decision.
Understanding the factors that influence battery degradation, such as charging habits and battery chemistry, can also help extend the life of your electric vehicle’s battery. By being mindful of these aspects, drivers can maximize the performance and longevity of their EV batteries.
