Q: When should I replace my battery?A: Depending on how you drive, the condition of your charging system, and a number of other factors, a battery lasts about four years on average. And when it does give out, there’s generally no sign of trouble -- your car just dies. But due to the nature of the chemical cocktail inside any battery, it may give out before the four year mark, or maybe it will last for several more years. So you have to ask yourself, “Do you feel lucky?”