I am remodeling a 1986 Jayco J-Series 806 and am thinking I want to install a battery (it currently does not have one), as I camp most often off the grid. Would someone mind walking me through: 1) what kind of battery I should be looking at purchasing (just for basic charging of phones, running lights.)? I do not have an ac unit and do not plan on installing one. 2) how would I go about installing the battery? (ie: does it have to hook up to the electric box? will it need a dedicated fuse?) 3) and anything else I need to know. Thank you for any assistance. The electrical aspects of the remodel are completely new to me and pictures are of TREMENDOUS help!