Looking to purchase a new battery but I am getting a lot of conflicting information. Going from the recommendations on here I should be buying a Varta silver ultra dynamic ZGB577400078 from TPS. TPS have told me they have three batteries on their system for my car and the one he 'thinks' it should be is an 067 74amp Excide. Audi do have a Varta for my car but have no other information on the product except it is a 72amp battery. Can anyone point me in the right direction? What spec do I want for a standard 2007 8P S3?