EV battery life is better than most people fear. Worried your EV battery will die in a few years and leave you with a $20,000 repair bill? This guide breaks down what actually happens to EV battery life over time, what speeds up wear, and what you can do to protect your investment. Most EV batteries are built to last 15 to 20 years, or well beyond the useful life of the vehicle itself. Not all EV batteries are built the same way, and the chemistry inside your pack has a real effect on longevity.