newbie with generator questions

so, if im only dry camping for 1-2 nights at a time, and I have two deep cycle batteries I should be ok? I hate to buy generator if im camping with full hookups most of time and would not need generator at a full hookup campground, its only the few times a season im dry camping that im worried about..with either one or two batteries what will and will not work? am I correct in that no outlets in camper will work on the battery?? so that would leave the TV out.. Im not concerned about coffee as I can cook that on stove.. but the kids like the TV w/dvd player... so the battery will run the lights, and that's it? I should be fine w/two batteries to run lights for two nights, but if my wife insist on running the TV, then what is an inverter that I keep hearing and what is difference between that and a generator and what is cheaper? also, will the battery run the slide? and if my batteries start to die on me, how long do they take to charge if I start my truck up? im sorry, all new to this..thanks again,