I just picked up a great idea that I'd like to share with all my fellow icemen. I was talking to an older fellow that had built his own shed. It was nice. What I really liked was the idea he came up with for a battery for his fish finder. He took the power supply (12volt) from an old broken cordless drill, wired it with a hot and cold wire and simply attached it to his depthfiner/fishfinder. I went home and tried one of mine. It works great. The only thing you have to do is figure which of the two prongs is hot and which is ground. It is pretty easy though, the one nearest the exposed ground strip is the ground terminal. I am going to carry it both as a backup and as a power supply for the 12 volt interior light that I am wiring into my Clam Fish Trap shed. I am going to buy one of those inexpensive "compartment" lights at Walmart for about $3 and attach it to the roof rod of my shed so that I don't need to fool with a propane or gas lantern. (The fumes aren't good for you anyway, and my new Coleman heater is the kind that is safe for the indoors and did a fine job this past weekend in the near zero temps.) Anyway, I thought this was a great tip. Hope you guys like it.