Thanks for the battery advice guys. I think I will go with the lawn tractor battery to power the light system, I like the idea of a small lightweight battery vs. a 75lb deep cycle! Tod, this motor doesn't have a pull start, electric only, so I kind of like the idea of having 2 batteries aboard just for insurance during the winter. I also have one of those portable power packs that I'm planning to bring along as well. Being stuck out in the marsh in sub-zero temps with a dead motor is an experience that I'm not too eager to repeat!
I absolutely agree with your approach with no pull start. That is what I'd do too. A second reserve battery that can turn the boat over is prefect. There might be a small AGM (or similar) that will fir your deep cycle needs - the ones that I did not get great service from were West Marine brand.
 
	 
 
		 .  If you are going with two batteries, think about putting an automatic  charging relay (ACR).  Allows you to charge both batteries when running, but isolates them at rest.  Not all that expensive and would be nice to not have to worry about charging your deep cycle if your motor puts out enough juice to manage both.
.  If you are going with two batteries, think about putting an automatic  charging relay (ACR).  Allows you to charge both batteries when running, but isolates them at rest.  Not all that expensive and would be nice to not have to worry about charging your deep cycle if your motor puts out enough juice to manage both. 