Hello, I am thinking about changing the battery on the 8P5 to Varta Dynamic Silver. However, I found from the Varta website the battery for 8P1 (585 200 080 3162) and the battery for 8PA (577 400 078 3162). Unfortunately the size of the batteries are different and the specifications are different! The one for 8P1 seems to match the S3 spec. (195kW/265PS), whereas the one for 8PA has a different spec. (147kW / 200PS). Guess I should go for the one for 8P1?! thanks so much for the advice in advance.