It all depends on thermal management. Tesla uses liquid cooled active thermal management, and they have less than 10% degradation over 10 years/200k+ miles. Nis

It all depends on thermal management. Tesla uses liquid cooled active thermal management, and they have less than 10% degradation over 10 years/200k+ miles. Nissan went with passive air cooling for the Leaf, and they are seeing up to 50% degradation in just a few years and less than 50k miles.