Quantifying Battery Degradation
EV Battery Degradation
Battery degradation doesn’t happen all at once. On average, EV batteries lose about 1-2% of their range per year depending on the factors discussed earlier. Fortunately, most batteries are designed for durability and will outlast the usable life of a vehicle.
If we look at the Tesla S model battery, researchers have found that traveling 500,000 miles on the original battery should not be a problem. Just because the battery degrades does not mean it is not drivable; it simply loses some of its range and charging efficiency.
In blog posts, Tesla model S owners have noted that approximately 95% of the battery retains its battery function during the first 50,000 miles. A 5% battery degradation could equal 20 miles of range. Oddly enough, the battery only degraded another 5% during the next 100,000 miles. So, 150,000 miles resulted in a total average of 10% total battery degradation. Typically, you wouldn’t need to consider replacing your battery until degradation reaches 50-65%.