I am going on a 2-day camping/fishing trip next weekend. Of course, the only campsites available oare the non-electric ones. Are there any other realistic options for charging my battery? I was thinking about one of those trickle-type chargers that you hook up to the cig. lighter in the tow vehicle, if there is such a thing. If so, I'm concerned about whether that might drain the battery in the vehicle too much? I'm not interested in the solar chargers either, but if anyone has a suggestion I'd like to hear it.