I find the battery can be low after the car sits for a few weeks, and I have read comments about having to lock the car to minimize the draw from the security system or something…..I just use a 12v socket trickle charger if I’m leaving the car for a while. Bu then if the battery is without power after driving for a while, that sound like something is draining the battery even when running.
Porsche Club of America, Upper Canada Region