battery compartment

My idea is to remove the rear seat backrest/s for a vacation trip. I don't want to remove the entire rear seat installation, just the backrests so that I can fold the remaining lower parts of the seats forward and put a wooden cover over the battery compartment. I could then store a few boxes...

Hi together, does somebody knows what these wires are? They do go to the back of the car and before I start ripping it all apart I thought somebody here has an idea…. Thanks in advance.