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XS batteries are over priced ($260+) AGM technology batteries that trade off higher voltage (16V) for lower cranking amps and a small weight savings. They are designed for racing applications. As your charging system is geared towards around 14V, the system is not going to be happy long term.

If you want to save some weight, and run a fully sealed AGM designed battery that is fully compatible with your charging system and street use, look at an Optima battery. You will probably also save some $ on the purchase price as well………….

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I really dont mind the weight, I just want a longer powerful battery. I tried a bosch battery and when I went to a drive in, I had to start my vehicle every ten to fifteen minutes lol. I just thought the xs would be better than a OE battery. I had a 110ah when I bought the Cayenne and want to replace it with the same or equivalent battery but nobody sells it but the dealer. oh well.

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