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955/957 Cayenne DIY: Battery Replacement Guide


955/957 Cayenne DIY: Battery Replacement Guide

Old 07-15-2016, 01:58 AM
Join Date: Oct 2011
Posts: 133

Originally Posted by 997JJ3 View Post
Thanks for a great DIY. Timely as our 09 CS battery was slowing heading south. Replaced today w/DuracellAGM from Battery Plus for $200. Biggest hassle was trim pieces. Total install time for first timer was about 45min
I know it's forever since you did this... Do you happen to remember if you got the H8 or H9 size battery?
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Old 07-23-2016, 05:18 PM
Join Date: Oct 2011
Posts: 133

Originally Posted by hgupta View Post
Is there any disadvantages to an AGM battery? I see that Duracell Platinum one from battery plus fits perfectly (Group 95R H9), and is AGM technology. I've been upgrading and adding electronics lately, and I need something that is rock solid.


It certainly has an impressive specs, but also twice as expensive as others.

Also, I have a 2010 Cayenne S. Does that year require "registering the battery"? Or is that only on newer cars?
Did the battery swap this morning. Decided to use an AGM 95R size battery.
Works perfectly in my 2010 Cayenne
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Old 08-02-2016, 12:53 PM
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Join Date: Feb 2005
Location: Palm Desert: 2006 Cayenne S and 2009 C2S
Posts: 1,420

It's amazing that my orig battery has lasted 11 yrs and is still going strong. But it won't last forever so I replaced it with a $220 Bosch AGM battery.

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Old 08-02-2016, 07:19 PM
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Originally Posted by hgupta View Post
Also, I have a 2010 Cayenne S. Does that year require "registering the battery"? Or is that only on newer cars?
Your 2010 doesn't have battery registration.. that began with the 958 series.. and it's unclear if it's actually necessary or doable on those vehicles. Two Porsche service departments dismissed it out of hand - said they've never done it. Several tools that claim to be able to do it - don't.

I think the function is useless anyway since the Cayenne drastically changes charging parameters when you switch from "normal" to "sport" mode (basically a 1VDC increase in charge voltage in sport.) I believe that was done to optimize MPG in "normal" mode since that's where the MPG is rated (and they pay a gas-guzzler penalty for MPG..)

BMW did do "registration" - changing the charging rate for new vs older batteries - but I think Porsche just thought about it and then said "nah..."
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Old 11-25-2016, 12:55 PM
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Join Date: Nov 2016
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Thumbs up Perfect guild for 2009 Porsche Cayenne V6

Cant thank you enough for the guide. On my 2009 I did use a battery tender attached to the front 2 jumper terminals and all computer info was retained. Purchased AGM from autozone for $195 was a perfect fit and it was in stock. The picture on the rear time pieces were a little different on mine from the attached photos but I was a great video that guided me through the removal of the rear seat trim pieces. The whole job took me 40 min to complete and there were zero complications. This is one super easy DIY project. I am not a mechanic by a long shot (office job my whole life) but I do love to tinker and I think just about anyone could do this without any issues. Just be careful when pulling and placing the battery - it is as stated before in the forum very heavy and you must lift it up and over the vehicle and all towards the center of the car. It can put a strain on your back so if you have a touchy back, get a friend to remove and replace )

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