First, a little background on me and my boat. Im new to this website and this is one of my first posts here. I just bought a used 1648 Sea Nymph Jon with an electric start 30hp tiller motor for use as a general purpose fishing/hunting boat. As far as fishing, I will use it for small river catfish, trolling lakes, bass fishing and maybe some nighttime bowfishing. Its got a carpeted deck built into the front with a pedestal seat and a carpeted floor throughout the rest of the boat. My question is regarding the battery setup for the boat. The boat came with a dual purpose deep cycle (525CCA, 75AH, I think). Right now, it is equipped with navigation lights, small livewell w/aerator, 40lb thrust trolling motor, and a Hummingbird fish finder. I do not intend to change much of this setup. My biggest concern right now is using the single battery for trolling (hopefully a good portion of a day) and then trying to start the engine. Im planning on purchasing another deep cycle battery for the trolling motor/accessories and saving the current battery for reserve/engine starting. I have done a search on this forum but my reading hasnt really answered my questions. I did come up with some info to calculate the drain on the battery that Ill look into this evening that might answer my question. But in the meantime, I guess my bottom line hypothetical situation is ..Would this setup be adequate for five hours of fishing at night using running lights, fish finder, intermittent use of the livewell aerator, and constant use of the trolling motor on the lower power ranges? Thanks for any advice.