Absorbed Glass Mat (AGM) Battery,

General information 

Audi TT equipped with the 3.2L V6 engine are equipped with an Absorbed Glass Mat (AGM) battery located in the left rear luggage compartment in the spare tire/wheel well.

Servicing 

Unlike conventional lead-acid batteries, AGM batteries are completely sealed and use a fiberglass mat construction which completely absorbs the electrolyte. As a result, no excess electrolyte is present and it is not possible to check the electrolyte level or otherwise service the electrolyte.

Specific removal/installation, testing and charging procedures are required for AGM batteries. Heed all notes pertaining to AGM batteries in the following procedures.

If it is determined that an AGM battery is malfunctioning, replacement is necessary.