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I have a 2004 Cayenne Turbo and I am away for the week and the wife tells me the car wont start.  I have a couple questions i hope someone can help with.  First is what are the sizes of the batteries under the seat and the size in the rear.  I can't remember which battery I replaced 3 years ago.  It was an H8 Group49, but I cant recall if that was the front or back battery.

 

Also, can I tell her to connect the battery charger to the under the hood post to charge the batteries? Will it charge only one or would it charge both?  Thanks

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"Depending on specification and air-conditioning zones, the Cayenne is fitted with a battery having a capacity of 340 A/70 Ah to 450 A/95 Ah. As on the Cayenne S and Cayenne Turbo, the alternator is water-cooled and has a nominal output of 2100/2660 watts, depending on battery capacity.


All Cayenne models can optionally be equipped with a backup battery (starter battery). This backup battery ensures that the vehicle can still be started even if the vehicle battery (main battery) is discharged. The capacity of the backup battery is 480 A/85 Ah.


If two batteries are fitted to the vehicle (main battery and backup battery), these are connected or disconnected to the bus bar in the power distributor through a relay. The switching of the two batteries is controlled independent of the load management (function is integrated in the vehicle electrical system control unit). The starter relay of the 2nd battery is actuated parallel to the starter relay. That means for every start the starter is supplied from both batteries. The backup battery is disconnected from the vehicle electrical system when the engine is switched off and then supplies just one consumer, the vehicle electrical system control unit."

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Thank you,  I appreciate it.  Do you know the replacement battery sizes.  I know one of them is an H8 group 49.  I think that is the one under the seat, not sure.

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