How long is the life of an electric car battery?

After long-term use, it is normal for the performance of electric cars batteries to decline to a certain extent. Current national regulations stipulate that during the warranty period, battery performance degradation cannot exceed 20%. Otherwise, the manufacturer will replace the battery for the car owner free of charge. So, is it necessary to replace the entire battery pack? No, the battery pack is composed of many battery cells, and its performance principle is in line with the wooden barrel theory. If there is a problem with one battery cell, it will affect the performance of the entire battery pack. Therefore, the manufacturer will replace the faulty battery cells free of charge to restore the high performance of the battery pack.

Chart of battery capacity decay over time at rest. In addition, experts have also studied the decay of batteries or Electric Car during normal storage. The results show that even when the electric cars is not running and stored statically, the battery power will gradually decay. Taken together, the longer the mileage of an electric cars, the greater the attenuation of battery power. In addition, if the electric cars is stored for a long time, the battery power will also be reduced.
During the use of ELECTRIC CAR, battery degradation is a normal phenomenon. As long as the degree of attenuation is within the normal range, it is acceptable to consumers. During the warranty period, if the battery performance declines by more than 20%, the manufacturer will replace the battery cells free of charge. Attached are the battery warranty periods of some mainstream models:
From all aspects, electric cars are still very difficult to use when their mileage is low. It takes a lot of time for users to adapt to the car, and its characteristics change greatly with use. This makes actual customer satisfaction lower.
Note: For the same car, the mileage obtained under different usage conditions, especially at high speeds, will be completely different, so the same experimental conditions need to be compared together. It's really difficult to compare with mileage.