Audi A4 Owners & Service Manuals

Audi A4: Battery

Battery general information

Because of the complex power supply, all work on batteries such as disconnecting, replacing, etc., should only be performed by an authorized Audi dealer or authorized Audi Service Facility.

Multiple batteries with different technologies may be installed in your vehicle:

  • Vehicle battery (for example, for starting the engine, basic power supply).
  • Auxiliary battery (for example, for recuperation or optional equipment).

Not running the vehicle for long periods of time

The battery will gradually drain if the vehicle does not run for long periods of time. To ensure that the vehicle can still be started, the electrical equipment will be limited or switched off. Some convenience functions, such as interior lighting or power seat adjustment, may not be available under certain circumstances. The convenience functions will be available again when you start the engine.

Even when electrical equipment is switched off, the equipment can still drain the battery if the vehicle is not driven for Long periods of time.

Deep draining results in a chemical reaction that destroys the inside of the battery. The battery must be charged every month to prevent this. Contact an authorized Audi dealer or authorized Audi Service Facility for more information.

Winter operation

Cold weather places an especially high load on the 12 volt vehicle battery. This results in reduced starting ability. Have the battery checked by an authorized Audi dealer or authorized Audi Service Facility before cold weather begins.

Replacing the battery

Applies to: 12 volt vehicle battery

All work on the battery must only be performed by an authorized Audi dealer or authorized Audi Service Facility.

The 12 volt vehicle battery was developed based on the installation location and is equipped with safety features. If a 12 volt vehicle battery must be replaced, ask your authorized Audi dealer or authorized Audi Service Facility about the electromagnetic compatibility, size, and the necessary maintenance, power, and safety standards for the new 12 volt vehicle battery. The battery vent of the 12 volt vehicle battery must always be on the negative terminal side. The battery vent on the positive terminal side must always be closed.

Only use a maintenance-free 12 volt vehicle battery that adheres to the TL 825 06 and VW 7 50 73 standards. These standards must be from October 2014 or newer.

WARNING

  • All work on the battery or electrical system in your vehicle can result in injuries, chemical burns, accidents, or burns. Because of this, all work must be performed only by an authorized Audi dealer or authorized Audi Service Facility.
  • Always have an authorized Audi dealer or authorized Audi Service Facility replace the 12 volt vehicle battery, because and adaptation must be performed on the vehicle electrical system when the battery is replaced.

    Only an authorized Audi dealer or authorized Audi Service Facility has the necessary technology to perform the adaption correctly.

    Otherwise, there could be a loss of safety- related functions among other things, which increases the risk of an accident.

  • Applies to: vehicles with a jump start connection in the engine compartment: The charging cable or jump start cable must never be connected directly to the 12 volt vehicle battery. Only use the connections in the engine compartment.

WARNING

California Proposition 65 Warning:

  • Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harms.

    Wash hands after handling.

Note

  • If the vehicle will be parked for long periods of time, protect the battery against the cold so that it will not be destroyed by "freezing", Charging the 12 volt vehicle battery.
  • There are electrical components under the cargo floor behind a trim panel that warm up during operation. To reduce the risk of the components overheating, do not store objects such as blankets under the cargo floor. If the components overheat, they will switch off temporarily. This will be indicated by a message that will be displayed in the instrument cluster until the temperature returns to normal.
  • Always have an authorized Audi dealer or authorized Audi Service Facility replace the 12 volt vehicle battery, because and adaptation must be performed on the vehicle electrical system when the battery is replaced.

    Only an authorized Audi dealer or authorized Audi Service Facility has the necessary technology to perform the adaption correctly.

  • Using unsuitable batteries may void the vehicle's operating license.

For the sake of the environment

Batteries must be disposed of using methods that will not harm the environment.

Do not dispose of them in household trash.

They contain harmful substances and recyclable raw materials. Contact an authorized Audi dealer or authorized Audi Service Facility for more information.

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