I apologize upfront for not having a picture to go with this question but I am guessing enough people here will be able to tell me what it is I am looking at. On the left side of the bike directly above the rear passenger foot rest, zip tied to the rear sub-frame, is a small electrical plug with a male/female end, and a cap on it. Is this a 12 volt power outlet or a battery tender. I read through the owner's manual, but perhaps missed this item. Just curious more than anything.