My skiff currently has a 2001 Mercury 20EH 2 stroke non tiller on it .I have read that the charging system on it is very minimal and i can't charge 2 batteries with it do to that. Iam setting the boat up and have 2 batteries. A start battery at back of boat and then a deep cycle under the center console . The deep cycle as its hooked up now to a fuse then switch panel to run = nav lights , bilge , livewell pump ,fish finder , horn . I fish with live bait alot and thats where iam concerned . Should i try to run just one battery and let the charging system do what it can Or Leave it the way it is ? Later down the road , i planned on looking for a used 35 or 40 hp outboard ( short shaft non tiller) if i can find one Would that allow me to run dual batteries to help ?