I have a Glastron GS 205 FS with 5.0L Volvo Penta 55 LB MinnKota. I have 2 house/starting batteries (I didn't want to get stuck with a dead battery after fishing while using the radio), and a trolling motor battery. It's a pain removing the boat cover, opening the engine hatch, getting a 50' extension cord, attaching the battery charger to the trolling motor battery. I have heard about VSR's (voltage sensitive relays). Could I just connect the battery to the alternator? Maybe with a switch so it wouldn't charge until I want it to? How do other people charge their trolling motors when they go camping for a week or two without any power around? Any help would be greatly appreciated.