Originally Posted by Fivenikkels
What ependydad is saying is plug in your harness plug just as if you we're going to tow that will give you power to open it up
Thanks. I'm realized I'm being (unintentionally) painfully vague. Thanks for translating!
If that doesn't work- I'd be tempted to move the battery from the jeep, connect up the old one and run the slides out and then out the battery back into the jeep. I doubt it would kill it enough to need a jump. (Pure guess, to be honest, though.)
Otherwise, to the OP- read up on battery disconnects. At the end of the season, make sure your battery has a full charge and then disconnect it. It should essentially hold it's charge all winter with only losing a little power. That way, you won't have hassles next year.