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Had somehow the same problem on my Porsche 911 last year : during winter I didn't drive enough, I drove it again in March (few km), then I stopped and when I tried to go back home, I ran out of battery and couldn't start the engine : all warnings alerts were blinking. I had to call Porsche assistance to tow it to the garage. Well actually there were also a real defect in one sensor, making it draining the battery. Also, on 911 (991) the battery is a li-ion battery : smaller and lighter but weaker power.
The best way to avoid this is to use a charger at home if the car is not used for an extended period of time.
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