I've had my Tesla model 3 just under a year. My battery has lost just less than 1% range (4km) in this time.
Battery warranty is 8 years or 160,000kms.
In 2019, Elon Musk commented on the Model 3's battery longevity, saying that the Model 3 has a battery that should last 300,000 to 500,000 milesAlthough the car's battery may last only 300,000 miles, other parts of the car are designed to last much longer. The car’s body and drive unit are made to last one million miles. So even after the battery needs to be replaced, the car still has a lot of life left.
The average person in the US drives an average of 14,000 miles per year. If a Tesla battery only lasted 300,000 miles, it would still last approximately 21 years for the average driver.
https://www.notateslaapp.com/tesla-reference/656/how-long-do-tesla-batteries-last-their-rated-lifetime-mileage#:~:text=While%20at%20the%20higher%20end,last%20300%2C000%20to%20500%2C000%20miles.
