A dead battery will eventually stop a car from running, regardless of how many times it is charged. If the battery is damaged in any way, it poses a serious danger when charged. A battery can easily be changed at home.
Take the battery to be tested. Most auto parts stores will perform the test at no cost. If the battery is holding a charge properly, it may not be the cause of the problem. If there is visible damage to the battery, replace it, regardless of whether it functions.
Purchase the replacement battery from a reliable dealer. The dealer should be able to tell you which battery the car requires. If the wrong battery is installed, it could damage the electrical components of the car.
Put the safety glasses on. Battery acid causes permanent blindness. It is imperative to take the necessary precautions for eye protection.
Use pliers or a socket wrench to remove the negative "-" cable terminal from the old car battery. Remove the positive "+" cable terminal only after removing the negative cable terminal.
Remove the bracket or frame, which is holding the battery in place. Lift the battery out of the car carefully, as the battery is most likely heavy. If the battery is cracked and leaking fluids, wear heavy duty work gloves.
Use a battery terminal cleaner or wire brush to clean the inside of the cable terminals. If they are damaged in any way, consider replacing them.
Place the new battery in position. Ensure the battery has the same orientation as the previous battery to avoid crossing the cable terminals. Secure the new battery, installing the bracket or frame. Be sure the battery is unable to move.
Connect the positive "+" cable terminal to the positive post on the battery. Connect the negative "-" cable terminal to the negative post. Tighten both connections. If the cable terminals are loose, the car may not start, and the electrical components may malfunction.
Start the car to test the new battery.
