To maintain the charge on your Porsche Panamera's battery while you're away I recommend the NOCO Genius Battery Charger and Maintainer # 329-GENIUS10. This will attach to the battery itself on your Porsche and plug into an AC outlet at the other end. Its various charge cycles and maintenance mode prevents any kind of overcharging while also ensuring your Porsche is ready to start as soon as you return. view full answer...
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