This past weekend, when I had my car’s oil changed, I also was told that I needed a new battery. Rather than buy a battery somewhere else, I just decided to have them do it for me to save time. However, I could have just gone to Battery Life Predictor. This tool asks how your battery is functioning and then if you choose “weak” or “not functioning” it suggests having it tested by a battery expert…sort of what I’d do even without this website’s advice. On the positive note it does allow you to put in what type and how old a battery you have and it tells you that particular battery’s expected lifespan.