Rest assured, battery degradation is completely normal! Nissan considers 80% battery capacity after five years to be acceptable, but if the 40-kWh battery for your Leaf drops below 70% capacity, check with Nissan to see if it’s still under warranty.
Nissan offers an eight-year or 100,000-mile warranty for the 40-kWh battery. Keep in mind that your driving style, charging habits, and environmental conditions are the biggest factors in how quickly your battery degrades.