Hi guys. I am wanting to throw a small stereo unit in my Alweld 1652 jet boat. Just a bluetooth receiver and two small speakers. Right now I have a 12V deep cycle battery up front for the trolling motor, and a 12V cranking battery in the rear. I don't really want to add another battery as I am trying to keep the boat as light as possible. Which battery would you run it off of? Would a small stereo like that significantly drain a single 12v battery? Only other component currently is my graph, which I have going back to my engine battery. I have a four switch panel I plan on installing, also may include a 12v socket to charge phones and such. Thanks in advance for the help!