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FWIW, I keep a small solar panel battery maintainer sitting on the dashboard of our infrequently-driven road trip vehicle, which is another option if your car is parked outside. Most of the German automobile factories use these same type of solar panel to keep brand new cars charged during shipping and while sitting in the storage yards at the ports.....
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2015 BMW i3 BEV, Giga World (Lodge interior), Tech/Driving Assist Packages, 30K miles
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