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2003 996 Cabriolet Battery life

Electrical and Electronic

Vehicle Information: Model: 996 Cabriolet; Year: 2003; Body Type: Cabriolet; Total Mileage: 16,000 mi.;

Why is this car the only one that I have ever owned that requires a trickle charger to maintain battery life? The vehicle has had ordinary use (including two long trips from 2,500 to 10,000 miles) with inactivity periods of no longer than three weeks duration. Yet, the original battery failed recently, and I had to purchase a Porsche Charge-o-Mat to prevent recurrence.

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