Yeah if I were you just use the gas outboard motor because you would probably use up all your battery power like you said. At 40hp your outboard should be pretty quite compared to my family's 110 hp ha ha. It usually does not make a difference for me when I use my outboard. When you troll let out around 150 yards of line so you will be long gone when the fish sees your lure. Another tip is to do a sort of zig zaggy motion while trolling. All of this is assuming your trolling with lures and not live bait. If you are using live bait then I would use your trolling motor so you can use a slower presentation technique. I have caught fish jigging in about five feet of water with the outboard running so I do not know how much the fish get ancy about the noise. Good luck!!
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