Whatever marine battery you need, whether it’s for a houseboat or a 30-foot sailboat, you’ll want to know the different options available to you, and the pluses and minuses involved. Selecting the right battery for you will depend on how you use your boat, the cost, and the kind of boat you have. The most common chemical types are: gel, flooded and Absorbed Glass Mat (AGM). Here are the key points of each.