2) Check Engine Light/Battery Warning Light The check engine light is always a good indication of something off with your vehicle. The battery power being weak will trip the check engine light. If your check engine light is on, be sure to check the battery power level. Additionally, newer cars have a battery light, similar to the check engine light. This will only light up if there’s an issue with the battery. 3) Age A car battery lifespan, in perfect conditions, is about five years (but can be much longer if you use our battery reconditioning course). If your battery is coming up on the five to six year mark it’s time to start looking for a replacement or recondition it to give the battery a new life. 4) Electrical Component Issues One sure sign that your battery is beginning to fade is if electrical components are struggling to operate (such as lights, windshield wipers, power locks, and windows). View our Free Presentation to learn how to bring old batteries back to life again