I have been riding BMWs since 1991 and the one time the battery died was the time I picked up my first and new BMW at the dealer and they had removed the diode plate for a rider that was passing through town. They forgot to replace it…so much for a pre-delivery check. LOL By the way, my everyday factory fitted conventional lead acid batteries last 10 years and in cars 14 and 16 years. The AGM in the 2016 R1200 GSA LC is still going strong.
But AntiGravity wants a ridiculous $1200 for a 12V 80Ah battery for the Porsche. Really I can get almost 5 quality AGMs for that price.