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3 weeks should be fine the battery should still be good but doesn't hurt to use a solar charger. Not sure if you can charge from the cigarette lighter may have to use the under hood posts and route the cable into the car with the panel on the dash. It may depend on how cold it gets where you are parked. Also you can keep a battery pack in your trunk like a powerall that you can charge off the trunk cigarette lighter while you drive. It packs enough punch to jump start your car in emergencies and can hold its charge for a few months.
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