I've never bought an Interstate battery, but I have bought a few cars that had Interstate batteries in them, and those batteries lasted forever. I bought my Neon 5 years ago with an Interstate in it (not a new one either), and it's still going strong. I was just thinking last summer, as I was getting a free replacement battery for a Dura-Last that didn't last (with 2 weeks left on its full replacement warranty ) that the next time I need to buy a battery, I'm going to buy an Interstate.