Trisha Hessinger, host of DIY Car Care , explains basic service for your car's battery, engine oil, wiper blades, spark plugs and air filters. Battery Service Battery problems are the most common reason for roadside-assistance calls. Once the engine is running, the battery stores and stabilizes the current that allows the electrical system to operate and to power the lights, the radio and other electrical components. Batteries come in several styles. Periodically the cells on these must be checked, and if necessary, distilled water must be added.
Most new batteries have a sealed casing and are marketed as maintenance-free.
Despite their name, even maintenance-free batteries require minimal care. The posts and cable terminals must be kept free of corrosion and deposits so that the battery can continue delivering its charge at peak efficiency. Perform this service about once a year. Locate your car's battery. Carefully lay the detached ends of the cables to one side.