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In simple terms, a battery is an electrical storage device. Batteries do not make electricity they simply store the power until you are ready to use it.
So when you turn the key to start your car, the battery supplies power to the starter motor, which turns the engine over. At the same time, power from the battery is supplied to the spark plugs, or glow plugs, in order to ignite the fuel and air mixture that has been compressed in the engine combustion cylinders.
The battery power used during the starting up process is then replaced by the alternator, which supplies the bulk of electrical current to your car's electrical systems, keeping your battery fully charged.
The battery strength or cranking ampage is generally affected by the amount of work it does and the conditions in which it has to work. Also, over the past few years, in-car technology has grown to include items like air conditioning, digital music players, satellite navigation systems and other electronic gadgetry. All of these increase the demand on your car’s battery and charging system. Consequently more frequent checks are recommended so that your car battery maintains its optimum working level.
Regular battery checks can help identify and prevent premature ‘battery failure’, which can result in a vehicle breakdown at a most inconvenient time.