How long does an EV battery last before needing replacement?

Most EV batteries are designed to last 8 to 15 years or 100,000 to 200,000 miles under normal use. Federal regulations require automakers to warranty EV batteries for at least 8 years or 100,000 miles. In practice, most EV batteries retain 70 to 80 percent of their original capacity after 100,000 miles, meaning significant degradation is rare within a typical ownership period.