Originally Posted by Antigravity

If the Car is staying charged and lasting a good few weeks then that seems normal, and at 60Ah you should be getting a very good static sitting time. But I must qualify that with my experience is with the Sports Car Models NOT the Porsche SUV lines. We know the more modern 991s really have quite a low Parasitic Draw on the battery after going into their systems shut-down, so I would assume the same with the SUVs, but each year Vehicles are getting newer features and more complicated electronic/computer controlled systems so I'm also just learning about the Cayenne from these posts. Just trying to relay what I know of the Lithium Batteries BMS. But I am not familiar with the SUV lines, so I don't want to mislead that I know about the Gateway System on the Car. But very 60Ah is a solid Ah capacity for a Lithium Battery, and I would think that battery will be a good one since Porsche is putting it in as a production Battery. The other Lithiums for the GT lines were not so good, but they were a different animal.

As far as the best MICRO-START... the best seller is the XP-10... but that can also do Diesel Trucks up to 7.0 Liters, and charge Tablets and Cell Phones multiple times. It fits in your hand, but the others which would do mostly the same thing but not start the Diesels are fine also. I would say the XP-1 and XP-3 are a good fit because they are compact yet will EASILY start the Cayenne about 25 times on one charge... plus still charge your cell phones about 4 times in a row too. XP-3 is very compact also.

Originally Posted by OCNYPORSCHE

Sorry to bring back an old thread but I think it’s important. The new Cayenne uses the LiFePO4 battery and that is pretty known now. But what I did not realize is that if the battery gets very low, the Cayenne will disconnect it in order to keep some charge. This makes using almost any charger useless. Ask me how I know! These new chargers cannot “reconnect” the battery, they can only charge a low battery back to full. Not a disconnected one!

After trying 4 chargers, I tried the jumpstart method which is actually in our Porsche owners manual). I connected my Antigravity XP-1 and after less than 5 seconds, my Cayenne reconnected, and I was able to start my Cayenne! Now I can use a LiFePO4 charger to bring it back to fully charged. This is a huge point. I will now carry this with me at all times!

Originally Posted by BCA01

As mentioned above, I have the CTEK Lithium US charger (Porsche ones are made by CTEK).

Although the manual only discusses charging via the under hood charging terminals, I plug mine into the 12v socket in the center console and it works great. I’ve left it hooked up for days at a time. The only weird thing that I noticed is that one time I opened the passenger door to mount a toll tag, which took several minutes, and the charger disconnected. Other than that one time, it has always stayed connected no matter what doors I open, how long I leave them open, how many times I open and close, etc.

My suggestion would be to just use the center console port (just shut the door over the cable) and I suspect it will work fine.

Originally Posted by BCA01

I am now dealing with a bigger problem. The car went into UVP (under voltage protection) mode as I was in the process of getting the CTEK Lithium charger hooked up. So the car is dead in the water....no power whatsoever. As a mechanism to protect the battery, the car disconnects itself from the battery when voltage reaches a certain level and doesn't reconnect until it sees sufficient voltage for some time. The manual says anywhere from immediately upon attaching a jump vehicle to 10 minutes from hooking up a charger/power supply. My CTEK supposedly has a way of overcoming this UVP but I tried it several times to no avail. Luckily, I have a good client advisor who lives not too far from me and he is coming by my house with a jump box after work this evening, which should get me back up and running. I went over the whole series of events with the shop foreman on the phone a few minutes ago and he said that'll do it. But he also said that what they were taught is that the battery won't reconnect until it sees sufficient voltage for 30 minutes. So I guess we will see....he said to give it at least 10 minutes connected to jump box before attempting to start engine even though it should start right away. The goal apparently is to get the battery to reconnect itself before starting engine.

He made the comment "I'm not sure why they had to make something so simple so complicated" and I agree. So my advice to any of you who might see a low battery warning on the PCM is to start your vehicle and drive it immediately! I'll post an update on how this turns out...