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A car battery stores energy that is produced by the alternator and helps start your car. The battery's stored energy also helps you use electrical accessories while the vehicle is not running, like the radio, lights, power outlets, and more. Car batteries wear out over time from exposure to high temperatures, corrosion, or a lack of battery maintenance. When automotive batteries begin to fail, they may no longer hold a sufficient charge to start the vehicle. If you notice the engine cranking slowly or taking longer than usual to turn over, it might be time to replace your battery. If you see abnormal amounts of corrosion around the posts or even the battery casing itself, your battery case may be leaking, and the battery should also be replaced. A bad car battery can cause a slow-turning engine, inconsistent or hard starts, or your vehicle's accessories or sound system may not operate when the engine is not running. You can find batteries for your car, truck, or SUV, as well as golf cart batteries, heavy-duty vehicle batteries, lawnmower batteries, and more. If you aren't sure of your battery's condition, or if you need to diagnose a problem with your starting system, take advantage of our free battery testing service. Battery testing can help you determine the health of your battery, and is a great idea before the seasons change to ensure your battery is up to the challenge this summer or winter. If you determine you need a new automotive battery but are unsure where to start, check out our helpful guide on how to choose a car battery. Make a confident repair with a new car battery, replacement battery cables, and much more from O'Reilly Auto Parts. For step-by-step instructions on your next project, visit our How-To Hub for content including how to install a car battery,how to replace a motorcycle battery, and much more. Keep your vehicle or lawn and garden equipment performing their best with the right parts, tools, and resources from O'Reilly Auto Parts.