Thank for this, very informative. I guess this is the future. I just wonder how someone would charge it, and how long it lasts in the extreme cold. I am thinking cost may not be too bad as the capacity is about 3-4 times of a typical power tool lithium battery then the Porsche “tax”, so maybe $600 or so? But the other thing to keep in mind is how often will this need to be changed? It may have a life >8 years. It may not even be considered a maintenance item anymore.

But, and this is a big but. The antigravity thread above is for replacement Litihium Ion batteries. I am not sure if the GT3 is coming with that. There may be a huge liability issue (I hate to bring that up), if you replace a Lead Acid with a Lithium Ion, and it catches on fire! For us, the 9Y0 members, the battery is a Lithium Iron Phosphate which is safer and comes standard. I do not think I would jump to replace a Lead Acid with a Lithium Ion.

Now I am not sure if the use case is the same for a Lithium Ion vs Lithium Iron Phospahte.

Thanks for this. Do you know if the battery that Antigravity is making is Lithium Iron Phosphate? They are calling it Lithium Ion, and I see your point re that they are all Lithium Ion. I think its the cathode in these cases that makes the difference.

Very nice!

Anyone know if the center console 12v socket will work to charge? My battery is apparently very low as I got a warning on the PCM last night (it sat at port for a while and on dealer lot for a few weeks, which made for a helluva paint decon process as well as a low battery), so I ordered the CTEK lithium charger and it will arrive tomorrow. All I see in the manual is mention of the charging terminals under the hood but I’m really hoping that the 12v socket will work as it does in my 911. If anyone has tried it, I’d love to know how it went. If not, I’ll post about my experience soon.

Keep us posted on this. Also, let me know which CTEK charger you bought and if it works.

Update: All seems well now. Once we attached the jump box to clamps under the hood, we waited a little over 10 minutes per advice of the shop foreman. After that, I opened driver door, electronics came on and it started right up. We let it idle for a few minutes and then disconnected jump box. Then we turned engine off, I hooked up the CTEK, and it immediately went to charging stage 2 (max current bulk charging), which lasts up to 10 hrs. This was totally different than what it did last night when it wouldn’t recognize the battery at all. Once it passes stage 2, it moves to stage 3 which is absorption via declining current and can last up to 30 hrs.

The CTEK I bought is the Lithium US. $80 on Amazon and I didn’t consider other options because I wanted it quickly. The one on the CTEK website now is the Lithium XS and it appears to have a slightly higher max amperage. I’m not sure what difference that would make, and I have no idea if it would have made a difference in having the charger overcome the UVP mode as my charger wouldn’t do. I doubt it.

I did consider attaching directly to battery but not until this morning. This occurred to me as I was literally losing sleep over this last night because it was the one thing I didn’t try. Never tried it. The manual didn’t say to do that but it also didn’t say not to do it. By the time I considered that, my dealer was committed to coming to my house to fix it, so I just went with their recommendations.

My dealer is Porsche North Houston. As has been said on this forum by many, they are one of a handful of “good guy” dealers in the USA and deserve all the business they can get. My salesperson/client advisor/brand ambassador is excellent and went above and beyond with a house call to solve this problem when he could have easily told me to call roadside assistance. I was referred to him by a friend of mine who is a great client of his, I’ve purchased two vehicles from him in the last 21 months, and I couldn’t recommend him enough. PM if you’d like his name and I’d be happy to provide.

Edit: I’m having issues multi-quoting but my responses are addressed to the ones above. I’ll try to figure that out...

The primary issue really had nothing to do with the CTEK. It was just coincidence that the battery got to a point where it disconnected from the car right as I was about to hook up the charger. I noticed low voltage on Tues evening, ordered charger immediately and by the time I had it 48 hrs later, it was too late. I cycled the ignition to “wake up” the computer as I have to do with my 911 for the charger to initiate and that appeared to be asking too much of the Cayenne battery at that point. It disconnected itself to protect itself. This happened before the charger was hooked up.

The only issue with the CTEK was that its supposed ability to overcome/override this UVP mode did not work on my Cayenne. I’m not sure if that was an issue with my charger or with the Cayenne computer/software. The tech I spoke to this morning said that the batteries are standard but the way Porsche writes the software to control them is all their own. Also of note is that I have the CTEK Lithium US. There appears to be a newer model called the XS. I have no idea if that model would be successful at overcoming the UVP on the Cayenne. I don’t anticipate ever getting to that point again but if I do, or if anyone else does, a regular jump start is the easiest solution to get running again and then you can charge or drive to get battery back to happy.

Yes, as of now, I would definitely recommend the CTEK. It immediately connected and began charging as designed when hooked up this evening. I’ll reply in a day or two if something goes awry but I don’t anticipate any further issues. I’ve also been extremely happy with my CTEK multi US 7002 for the past 2 yrs on my 911. It’s plugged in to that at all times when in my garage and never an issue.