LSR

Ordinarily, it’s been my experience that batteries are treated like tires - failures handled under the battery or tire manufacturer’s warranty, but not the car’s. But a battery that costs $2100, and to my knowledge can be obtained only from Porsche, ought to be a Porsche warranty item. What did your dealer say?

Schnave

Ouch! Sorry for your troubles. You have a good chance of warranty replacement if your alternator is faulty or if they find a parasitic load caused by a faulty control module. Otherwise, it doesn’t look good.

I checked the 2019 Porsche Warranty Booklet. On page 5 it states the warranty will not cover ”Batteries damaged from storage, lack of normal vehicle use, or non-Porsche approved electrical or accessory installation.”
https://files.porsche.com/filestore/...nty-Manual.pdf

On page 7 Porsche defines Normal Vehicle Use as;
.” . . at least 15 miles / 24 kilometers per day or 6000 miles / 9600 kilometers per rolling 12 months.
• If you drive less than the above-mentioned limits, or in the event of prolonged storage, contact your local authorized Porsche dealer for instructions.
(Note: A battery maintainer is available at your local authorized Porsche dealer. It must be used to maintain your vehicle’s battery state of charge if your vehicle will not be used for several days.)”

That gives them lots of wiggle room to stick you with the replacement cost, claiming you didn’t drive it enough to keep the battery charged. Dash cam wasn’t a Porsche dash cam? Sorry, you buy the battery.

You might get some good will from the dealer. If you pay for the battery, perhaps they can install it gratis. Worth a try. Good luck and keep us posted with the outcome.

Schnave

Yep. Big Catch-22! You’re lucky you didn’t engage the electric parking brake. There is no manual release.

I moved my transmission shift lock release wrench to the glove box. I put together a small tool kit for other gotchas.

The emergency hatch release requires a small screwdriver to remove the access cover and to slide the release lever. Problem is, the screwdriver is located under the cargo floor and you are kneeling on the cargo floor to access the release lever. Do yourself a favor and keep a small screwdriver in the toolkit.

The fuse boxes require tools for access. A T30 Torx and screwdriver are located in the tool kit under the cargo floor. If the cargo hatch fuse blows, see paragraph above.

If you have a dog cage strapped down on the cargo floor or happened to load 28 bags of mulch in the back (yes, they fit), you’ll be thankful you tossed a T30 Torx and a couple trim tools in your toolkit.




Fuse box under dead-pedal requires small screwdriver to pry off the cap and a T30 Torx to remove the cover.




​​​​​​Fuse box on dash requires a pry-tool to gain access. A screwdriver will damage the cover. Recommend a plastic trim tool for removal.

pewpewpew3000

I just got a brand new eHybrid and am getting bit by this. It's parked in a garage, and they leave the car unlocked with window open.

First time, car was dead after ~17 days. Got a jump, and it was fine. Just now tried to get the car again after 17 days and dead again. I have not jumped it yet. Bought a Microgravity starter.

Few questions
- Do I need a new battery? It seems like the Cayennes have a way to protect the battery.
- How long can these cars sit without being driven?
- What can I tell the garage attendants to do to make sure this doesn't happen again?

azra

if possible can we know what brand and specs these AGM batteries are? I am wondering if it would be possible to replace the lithium batteries with AGMs when the former dies out.

Schnave

User campyspeed posted a photo of his AGM battery. It is a Varta H8 rated at 92Ah with an external battery sensor.

Here’s a lengthy thread discussing the technical hurdles of retrofitting AGM batteries to factory installed LFP batteries with internal battery sensors.

https://rennlist.com/forums/cayenne-...e-battery.html

Ron.s

I’m getting mixed info on Porsche Batteries. The Lithium pictured early in this thread was a 13.2 volt Lithium. Now the Cayenne is shipping with an AGM.
My question is how the 48 volt PDCC works. Will I have a 48 volt Lithium in addition to the AGM 12? There is another view that a DC/DC converter let’s the 12 volt run the PDCC…seems odd if true!

Schnave

Your PDCC has a separate 48V battery to power the 48V PDCC motors. The battery is better described as a super-capacitor and is charged by the 12V system. It doesn’t care about the starter battery chemistry; it just wants a 12V source for the DC/DC converter to up-convert to 48V.

A super capacitor stores energy in an electrostatic field; not in an electrochemical reaction like batteries. This allows it to fully charge in less than 10 seconds and is designed to provide near instantaneous full discharge when needed; a feat that would destroy a LiFePO4 or AGM battery.

It is located under the cargo floor and should last over one million charge cycles; the life of the vehicle.

More on Super-capacitors here:
https://www.futurebridge.com/industr...ry-technology/
https://www.e-motec.net/ultracapacit...hicles-in-2021

Here's a great article with all the cool technology in your Cayenne:
https://www.motorauthority.com/news/...enne-deep-dive

More on the PDCC here:
https://www.hotcars.com/this-is-the-...e-sports-cars/

Here's the simplified electrical system schematic:

Ron.s

Thanks sooo…much. The depth of your knowledge and answers are always amazing and above and beyond🥸

rdboxster

Schnave was the only one that could answer what the box was, 48v battery, that takes up the last bit of storage space in the spare tire area.

rdboxster

I have struggled with the Porsche charger since I picked up the GTS with the lithium battery. I wasn’t able to get the 12v plug to work so tried the alligator clips on the under hood posts. Worked once than always dropped out of program to power only light on charger. Porsche swapped with another one and same results. It fully charged to green light another time but mostly failed. Just went back to 12v outlet, with the correct procedure to connect, and now it works. Goes to green fully charged light. Turned on accessory with headlights and the charger goes back to bulk mode eventually reaching fully charged. Tried this a couple times and it worked. Not sure what’s up with connecting to the posts.

Max82

Gents,I want to install a 60ah (or more) lifepo4 on my cayenne 2012 diesel 3.0 v6.OEM is agm 105ah.. ​​​​​​​have anyone of you have tried?Do you think would work? Please only relevant comments,i already know cost more ,etc Thanks

jtsmith18

Just took delivery of a 2022 Cayenne base demo. June 2022 build. Asked the dealer what battery was in it so they looked under the hood and the label says Lithium. I said not so fast, I reached under the cover on passenger side and guess what…. AGM. They were surprised, I was pleased , now I don’t need to buy another maintainer.

Antigravity

That is a great post and great article.... Excellence didn't really note the level of failure in the first two generations which was very very high. The latest Gen seems better but still having its issues. What amazes me, and I"m not trying to be too salty, is that these massive companies with all their brain power and resources for development can't make a battery that actually works and lasts with a high level of consitency. A123 has done white papers about how the Lithium Battery lasts 10 year, and saves big cost of ownership as well as the benefits of Lithium in many other areas, yet they have had so many failures in the McLaren's and Porsches with these batteries. Keep in mind I am not going of actually knowing the exact numbers, but they are high just from the number of posts and from first hand having person contacting us or coming up to us a Tradeshows and asking if we have replacments. The engineering in the interior structure and the intellectual engineering is great, but the physical Circuits boards is a big point of failure we have seen and can personally verify this because we have recieved a few dead A123 Batteries from McLaren and Porsches and everytime its components on the circuit board that have failed usually the mosfets. I think this shows a big disconnect between engineers actually understanding the real world demand of products. They are engineering them to handle certain load THEY deem are acceptable, but in the real world use these batteries encounter factors they didn't consider and it fries the boards. Anyway that is our opinion, they are also getting a bit to complex and it becomes a programming issue with the Linnbuss also. Again our opinion. Keep it simple, stupid. I'm still holding off on Bluetooth because I'm afraid of accidental shutdowns, or app issues, or people not having their phones and not being able to use the RE-START feature of our Batteries. I love technology, but too much makes it more prone to failure.

That fact is we are looking at some options that require simply changing out some of the cables to the Battery in the Porsche system, which is exactly what they do when they have swapped some of these Lithium Battery systems back to accept an AGM Battery, but we have not moved on it due to the fact that if anyone takes their Car to a dealership to get worked on then Porsche will say our Lithium Battery caused any and every problem with their Car the flat tire. But we are trying to find exact clarity on the exact wiring/cables needed so if the Customer can order those parts from Porshe then they can swap back to AGM use instead of being forced to continue using the Lithium Porsche Battery Then you won't have to use THIER proprietary Lithium and can use our Antigravity Lithium Batteries or a regular AGM Battery instead. But we'll keep you guys in the Loop.

Antigravity

Can be done if you have an AGM now... but you might want to see how much energy you are drawing on your system now because 105Ah is a large Capacity Battery, and while a 60Ah Lithium is much higher energy density than lead, a 105 Ah Lead it still not a exactly like-kind swap. You would probably want to go with a 80Ah Lithium and that would really do it... But if you don't have large energy loads and have not had alot of dead Batteries from over-discharge in you 2012 then you can get away with 60Ah Lithium fine... it roughly equivalent to about 90 Ah of Lead in the broader sense of capacity...