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Newer model AGM battery in older model Cayenne?


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It's time to replace the starter battery in my 2008 Cayenne S. Porsche calls for p/n 9A7-915-105-C, which I think has been superseded by 999-611-110-20, at least according to the dealer parts guy. It's a 110 amp wet battery. We measured batteries in parts today, and the newer Cayenne AGM battery, 958-611-105-21 looks to be the same size. It's a 105 amp gel battery.  Can I just install the newer model AGM battery in my '08 S and the terminals will be in the right place?  I know specs wise it should work

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7 hours ago, geoff said:

It's time to replace the starter battery in my 2008 Cayenne S. Porsche calls for p/n 9A7-915-105-C, which I think has been superseded by 999-611-110-20, at least according to the dealer parts guy. It's a 110 amp wet battery. We measured batteries in parts today, and the newer Cayenne AGM battery, 958-611-105-21 looks to be the same size. It's a 105 amp gel battery.  Can I just install the newer model AGM battery in my '08 S and the terminals will be in the right place?  I know specs wise it should work

 

First of all, AGM batteries are not "gel" batteries; they are absorbed glass mat design, which is totally different than gel technology. 

 

And yes, you can substitute the AGM battery for the flooded cell unit.

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8 hours ago, JFP in PA said:

 

First of all, AGM batteries are not "gel" batteries; they are absorbed glass mat design, which is totally different than gel technology. 

 

And yes, you can substitute the AGM battery for the flooded cell unit.

Thanks for confirming. And thanks for clarifying AGM and gel are different technologies. I googled the difference between the two to get smarter on the technologies, and definitely meant AGM

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Posted (edited)

AGM has several advantages over lead acid with basically no drawbacks except for slightly higher cost.

 

If you use a battery maintainer/charger I would recommend getting one that is "smart" (has a build in computer/electronics to keep me from doing stupid things) and for AGM batteries specifically.  For example I have owned the CTek 7002 forever, before I even knew what a AGM battery was, and it has SNOWFLAKE mode, aka "the 6 pack", for AGMs (icon literally looks like a 6 pack of beer).

Edited by Silver_TT
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  • 1 month later...

Many electrical problems with my 2009 TS, Bosch wet cell battery seemed to be ok, CCA test was good but it looked like it was 90% of the battery holder size. Did a check with a battery supplier and found that the battery was not for this vehicle, it was 760CCA so I put in the AGM replacement at 970CCA and all my electrical troubles went away.

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