I have mine VARTA battery since the car was made in 2006. Works like a charm. Great Batteries.
The dealer sold me part # 000-915-105-DH for my swap yesterday. Sadly I didn't note the mfg and now that it's buttoned up we'll never know... FWIW - it looked almost identical to the Varta #1J0 915 105 AG that I pulled out.
AutoZone. their Duralast Batteries have worked so well out here in CO.. i have abused them and used them and they still run strong... My buddy drove 10 miles on just the battery when the serp belt broke on his 2.0 and the battery made it, no problem...
Autozone Duralast gold, I think it was a 75 or 78 series, your cables should be just long enough to reach. I got a good deal on mine, and didn't have any trouble with cable length.
As for the battery choice, I'd personally opt for the Varta. The main reason being the service life you have received from the original battery. I wouldn't worry too much about the Varta's lower rating as the original has seemed sufficient over approximately 6 years and most Phaeton owners are reporting excellent life from the original batteries.
I replaced mine with an OEM battery from the dealership. Both mine and my wife's OEM batteries lasted 5+ years. We replaced hers 3 years ago with a Duralast or whatever - starting to leak at the terminal I'll be going back to OEM on hers very shortly.
The battery is very clean and the original Varta and the box is in tact. Car has about 42K on it, and has been in service for less than 3 yrs.
I've been using a Duralast battery for the past 2 years with no problems...
The cells on the original Varta battery have 6 caps, 5 of which are located under the stickers on the battery. Peel the stickers off. Your dealer hasn't been doing this right. Now, put on some goggles and some gloves. Take a quarter and turn out each cell cap and set them aside, someplace clean and someplace that you wouldn't want damaged by battery acid. Just a precaution. Look inside each cell. You should see the vertical plates, and they should be completely immersed in water- submerged about 1/4\". If not, add distilled water unto each cell until they are as such. It'll take only a couple of ounces.
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