 you know you're the guy stuck on the side of the road or in the parking lot at two o'clock in the morning when it will start uh... you know the the industry says four or five years and a g m batteries a g m batteries are a funny duck right there a completely different type of battery in a sense i've seen certain models gobble up batteries every three and a half years and i see certain models go six years but beyond six years i'm putting a battery in it and if i'm changing