Starter Batteries
When a car battery is connected to an external device, such as a starter, chemical energy is converted to electrical energy and direct current flows through the circuit. A good quality car battery will cost between $75 and $150 and, if properly maintained, it should last an average of five years. The primary purpose of a car (or SLI-Starting, Lighting and Ignition as it is known in the battery industry) battery is to start the engine. Its secondary function is to filter or stabilize the power. It also provides extra power for the lighting, two-way radios, audio system and other accessories when their combined load exceeds the capability of the charging system. Finally, a car battery provides a source of power to the electrical system when the charging system is not operating.
To find out more about how to maintain and increase the life of your battery, please click on the pdf link below.
This 5.5 meg pdf contains free consumer information about car batteries