Posts: 2323
Location: Stevens Point, WI | First off, I would definitely tell you to get the batteries "load tested" first. Why buy new ones if you don't have to? Maybe you are running your batteries down that much with all the stuff running off your trolling motor batteries? But I would definitely switch all your accessories and anything else hooked to your trolling motor batteries to your cranking battery or starter battery. I run everything to my starter battery and I have NEVER, and I mean mark my words have I personally had any problems not being able to start my motor because of all the stuff i have running to it. And the only time I really ever charge my starter battery is in the fall. Just to make sure it's at full charge and more of a peace of mind for me. But otherwise, I personally have not run my starter battery down to where I couldn't start the motor.
As for batteries, the new boat that will hopefully be in my driveway soon will more than likely have Trojans or AC Delco batteries in it. So I would tell you to check out the 31's and see if they will do the job with your charger.
As for your question about buying a Dual Pro and hooking it up to your big motor, I personally think it would be a waste of time and money. Reason being, I fish small waters comparted to say a few of the lakes in MN, or more like the rivers in North and South Dakota where you can run dozens of miles and for multiple hours to get to fish. Because if your spot jumping and your driving for two minutes or ten minutes, that isn't going to charge your batteries anywhere to where you will see a difference. The guys who will hook up a system like that are guys that are on the water all day and making those long runs. For example, the Professional Walleye Championship was held in Bismark, ND, guys were making 100mile runs and spending three plus hours just running to get to a spot. That's where having that system can come into play.
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