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The switch is a great idea. Another useful item is a small 12v solar trickle charger. I have a small one that I keep on my dash in the winter. It seems to keep the battery in good shape. They really are not that expensive. You can also modify them to charge just about anything you want without draining your battery. It really depends on your driving activities though, to get full use out of one. I normally park my car in the early morning before doing a 12 or more hour shift. If your driving about all day long it would not be as useful.
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