OK I was confused because you referred to the newer CTEK charger as a trickle charger earlier in the thread, saying that trickle chargers were needed:Sure. Trickle chargers usually never shut off. These are AGM batteries, not the older lead acid batteries. They want to be charged at 14.7V, not 14.4V. You can start by reading this massive thread
Caveat: The following is information only. Caveat Emptor. These products are not Porsche official products and your use is on you. What has worked for me, and the risks I take, might not work for you. The following is, in good faith, correct to my knowledge. If anything is wrong, say so and lets...www.macanforum.com
and watching this video
smart chargers will go to some kind of pulse mode only sending a boost when needed.
Further, AGM batteries ALWAYS want to be fully charged. Read your warranty, regardless if the car is out of warranty. They warn you. Not driving, plug it in.
And that is exactly why this thread exists. I'm guessing today, with inflation, its close to $1000 to get a new battery from a dealer and have them register. You can read the arguments in this and other threads. The arguements have gone on since 2012, when the first AGM went into a Porsche. AGM did come with start/stop. I would ignore the cynics. Want an answer, ask Porsche AG, not your dealer, but the car maker. Let us know what they say
In any case my charger uses a microcontroller to detect when the battery is fully charged, and then it stops.AGM charges at 14.7 volts, not 14.4, hence the need for trickle chargers, like the newer CTEKs, with snowflake mode which is for cold weather or AGM batteries (14.7 volts).
I read about the whole registration thing on Varta's website here and this is what they have to say
Granted that example was for VAG cars but the BEM codes are obviously identical to ours and contain the same information.Others diagnostic tools like Hella Gutmann or BOSCH KTS create the required battery specific information using drop-down options. Entering the BEM code is not required. You just need to select the capacity, manufacturer and technology. The serial number requested is just for traceability purpose. Any 10 digit number can be applied.