The battery for a 1996 Audi A6 wagon is located under the seat. Replacing the battery will require taking the seat cushion out of the car. The battery is only designed to last three to four years. The battery will need to be replaced as it will not be able to start the car after the charge goes down.
Open the back door to access the back seat. Pull the back seat up to remove it. Put the seat aside.
Locate the battery on the passenger side under where the back seat was positioned. Unbolt the battery cables from the battery with a socket wrench.
Unbolt the clamp holding the battery in place with a socket wrench. Pull the battery away from the car.
Place the new battery in to the car. Place the positive and negative cables on the battery. The red cable goes on to the terminal labeled with a "+" symbol. The black cable goes on the negative terminal.
Bolt the clamp over the battery to secure it, with a socket wrench. Place the seat back in to the vehicle.
