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System Failures due to low battery

Electrical and Electronic

Vehicle Information: Model : 997; Year: 2005; Mileage: 550;

Two Porsche dealerships are telling me that if my car sits for 3 - 7 days or more, I can expect 'System Failures' and other software/electrical problems with 'control units' due to decreased battery charge. They recommned that I put trickle charger on battery. I find it hard to believe that not starting the car for just a few days would cause this problem - a month maybe, but not a week. This came up when I took car into dealer with multiple electrical problems, including PSM failure, 'System Failure', etc. The car did sit for about 10 days before these problems showed up. What's your take on this? Thanks.

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