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Hi there,

I am having some electrical issues with my car, and I am suspecting the battery that was replaced about 9 months ago. I had a shop replace my starter and they told me that the car had "the wrong battery in it" - and that they replaced it with the correct one. About 4 months later some electrical issues start cropping up. It starts perfectly, but some important functions fail. The battery that they put in is a:

Interstate Mega Tron Plus, MTP-93, 850 CCA 1000 CA

Not the battery recommended for my truck on the Interstate site. Can someone let me know if this is an appropriate battery for my car - an 04 Cayenne Turbo? I do not mind using a non-Porsche battery at all, but just want to make sure it is the proper rating and if it is perhaps the source of my woes.



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  • 7 months later...
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Hi Mark ,

i´m not sure about availability of VARTA BAtteries in usa , but i have replaced on my 05CayenneTurbo this type : Varta Silver dynamic 12V 110Ah 920A, size is the same like the original one and price here in europe is around 160USD....working smoothly now.

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Thanks for the reply,

Turns out my battery was defective, but upon replacing it I still had electrical problems. After much work, I found that it was due to a short in the harness that runs under the carpet on the drivers side. I replaced it with the same item as listed above, which exceeded the minimums for my car, and is still working fine.


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