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Unless you have a 2nd car battery in mind, I wouldn't recommend running off your cigarette lighter connection for more than an hour or two maximum. Not unless your car is a manual and it will be pointing downhill for a push start in the morning. Not much fun when you can't get started out in the middle of nowhere, and car batteries are designed to produce a lot of power over a short period, not a long slow draw-down. I've already had to use my "astronomy" jump starter pack for a morning rescue (albeit because the car stereo was going most of the night...!).
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