Hi I'm having problems with my trolling motor I think, well this is my first boat and I don't know much, I have a 2007 g3, twin batteries. Well I went out last week and the trolling motor worked good, then I went out today and the motor was working fine and then it seemed like it died down like the I had it on speed 5 and it seemed like it was on 1 and I can stop the the propeller with my foot. Now does it charge automatically when the boat is running? Or do I have to charge it, thanks