5) Swollen Battery Case If you look under the hood and your battery case looks swollen, bloated, or malformed; it is a sign that temperature has affected the chemical components of the battery, shortening the lifespan. 6) Smell If you smell sulfur or rotten eggs under your hood, this is often a symptom of leaking battery acid. This can damage other engine components if not addressed quickly. If you notice this, you can either bring your battery into a shop and have them look at it or you can use our reconditioning steps and do it yourself. 7) Multiple Jump starts Needed If you’re having to jump your battery to get your car started more than three times a week, it’s time to replace the battery or recondition it. Excessive jumping can also damage other systems, so it’s best to get the battery replaced or to fix the battery yourself. View our Free Presentation to learn how to bring old batteries back to life again