Just got my first pop up a few weeks ago. I have been busy with roof repair stuff and am now getting arond to other stuff. What is the battery for? I have one in a plastic box on the tongue in front of the propane tank. But it does not appear to be hooked up to anything. I just noticed the plastic container is half filled with water, so I am assuming the battery will need to be replaced if I need it and cant get it to charge. I will be using a generator when I camp at a place that does not have hook ups, so just wondering what it is for and if I need it.