Your battery, or preferably two or more batteries, if fully charged will operate the slides and jacks many times before becoming drained. However if the batteries sit idle without a charge for a month or longer they will lose charge and over a couple of months be dead unless you completely disconnect them. Or use a small solar panel to keep them charged while stored.
A way to load a fridge without the need to cool it down first is to cool all of the items you plan to load into the fridge before placing them in the RV fridge. Load the food and Add a couple of the reusable cold packs and turn on the fridge just before you leave for your trip.
