The original MoPar battery in my '06 Ram 1500 was 7+ years old when I preemptively replaced it. The next two batteries were replaced at around the 4-5-year mark - neither failed though the last one tested weak and I had the shop replace it. The battery is in the engine compartment but is up and away from the engine, so engine heat is minimized. At least that's my theory why the original last as long as it did. Who knows?nd with our Chrysler 200 cars, my wife's battery was still good at 7 1/2 years.