04-29-2013, 02:17 PM
Look at amp hours of the battery, the higher the better. If all they give you is reserve capacity then divide that by two and that will be about the amp hours. I did a ton of research on this and the best thing you can do is get a battery with high amp hours, The highest group rating that will fit in your boat(24,27,31) and get a very good charger. the best batteries in my opinion are Trojan , odessey or Lifeline, optimas are made in mexico now and aren't like they used to be. I also went with AGM batteries for maintenance reasons. They are sealed and you dont have to fill them with distilled water. If you take care of them with a good charger they should last almost 10 years.