skinny I had that issue 2 years ago when I got my boat. Alternator or something I forget, went dead. Both my batteries died. First the radio, then the fishfinder, as I am looking for what is the cause and turn the boat towards east ave, I was way out past the condos deep, I may went another half mile and boat died. Cell service was non existent. Luckily I was out with a buddy and he was about a mile further away and deeper. One of our calls got thru to him between the 5 of us and he came and towed me in. I can't remember the issue for anything now, but we even tried taking his extra battery and hooking it up to mine and wouldn't work because we were both on the eyes and it was like 7am.