I see I see. I haven't bought the fish finder yet, and had no idea how it connected to power. I was reading through the forums and noticed someone using a "rock crawler" battery and charger, didn't know if I need that as well as the battery for the trolling motor. Obviously I'm trying to reduce the amount of crap I have to store on the boat, the battery is too much already! I appreciate your help. Once I get the graph, I may have a few more questions. Thanks!