Optima batteries are a great choice for a fish house. They charge a lot faster than a conventional flooded wet cell, which is important if you use a generator to charge your batteries. Also, Optima's are sealed so they won't leak, and are lighter to carry if you take your battery home with you to recharge between trips. Another nice feature is they discharge extremely slowly; you can let a fully charged battery sit for a year without problems. I've had lots of Optima's in my trucks and boats, they are excellent batteries.
Jim Carroll NPAA #13