I think the battery disconnect switches are under the step going into the cabin. I would imagine the batteries need charged up after 18 months. I would open the hatches and visually inspect everything. If you don't smell gasoline you don't have to run the blower. It's just like a big ski boat, but, with 2 motors. Obviously, don't crank it up until it's lowered in the water. Make sure it's pumping water out of the exhaust. Keep a close watch on the temp gauges.