Here is a picture of the left battery that the factory put in my W12 when it was new. As you can see, it is labelled both 'Varta DE' and 'VW AG'.
I have mine VARTA battery since the car was made in 2006. Works like a charm. Great Batteries.
Bosch Battery from Pep Boys 80 Bucks with a 20 dollar rebate. OEM fit.
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.
I've done all the scheduled maintenance on the car over the last 6 months including: Bosch S5 Battery
The best replacement battery i use in all my Vw's and other cars and trucks is Bosch..They are usually right over 100 bux but the are dependable, They also come with a 7 year warrenty.
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.
Just get a good battery from a known "brand" manufacturer (Bosch, etc) - they will last much longer than a supercheapie
I bought a Bosch for my car. Size 47. 600CCA at 0F, 750 at 32F (Part # S5531B) It's starts the car fine, but if the car has been sitting in the deep cold for 2 days.... it cranks a bit slow.
Now...my new Bosch battery I just bought for my 91 GTI...that thing is a POS. I should have bought an optima
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