I bought a 2003 240sd with the 350Mag and a smartcraft system. I had the batteries in my garage on a battery tender for the winter. I check them before reinstalling them and they showed full charge. They started the boat one time and then just clicks, not even enough juice left in them to get a half turn. My question is the smart craft flashed the engine icon and the bell icon the whole time we where running the boat. the engine had good oil pressure and water pressure, never got warm of made any kind of knocking or ticking noise. Could the bad batteries cause the smartcraft system to send the error?