I was reading through this plethora of information, I don't think anyone answered SolTriper regarding the use of 9volt  batteries; I like the idea for size and weight-but can these be used for depth finders? I also liked the Ryobi battery pack idea too, its just coming up with a receiver kit of some sort to plug it into, which lead to the idea of a few LED light mounted under the gun rails for in board lighting for night fishing. ;)

Windsailor