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Either one is fine. They sized the battery depending on trim level and accessories it was built with, along with the alternator amperage. I believe i have a 730CCA in my 1.8T GLS, but only because I wanted it. I have stereo equipment and added things like power seats. Can't hurt anything more than your wallet. I also swapped in a 120a alternator.
 
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After reading about AGMs lately, I would be more inclined to get a regular old lead plate battery for our low tech charging system, instead.
 
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I agree with VAGguy.

AGM batteries require 2 stage charging, a standard old alternator such as on the B5/5.5 Passat cannot properly charge an AGM battery.
Here is a link with a lot of good info.
Agreed.

In my Audis, you have to code the battery to the car, I believe for this purpose. It is like hitting the reset button on the charging system to recognize it's a new battery which takes a slightly different charging profile. The car will adjust as the battery ages to ensure optimal charging.
 
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