General information

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

The battery is one of the most important electrical components in the modern automobile. A battery that provides trouble-free service has a great influence on customer satisfaction. To ensure trouble-free service and optimum service life, batteries must be checked, serviced and maintained as per the instructions in this information.

Apart from starting the engine, the battery has other tasks. It acts as a buffer and also supplies electrical energy to the complete vehicle electrical system. In addition, the cyclical and capacity demands on the battery have increased due to additional safety and convenience features (electrical consumers) being installed.

The automobile battery has undergone many technical changes and improvements, and development of new battery technologies continues.

A new generation of maintenance free batteries uses physically and constructively optimized, lead-calcium coated positive electrodes. Advantages include minimal electrolyte consumption and servicing requirements, as well as improved charge stability over a longer period of time. Simplified checking of these batteries is also achieved with the charge indicator (magic eye).

Several different types of battery may be installed. Each requires specific servicing.