If you run a skiff, bay boat, or offshore boat, your battery setup matters more than a lot of people want to admit. It is easy to think about batteries only when one fails, but on a saltwater boat they do a lot of heavy lifting every trip. They power graphs, pumps, lights, trolling motors, shallow water anchors, radios, and the rest of the electronics that make a day on the water smoother and more reliable. That is why one of the questions I get all the time is whether upgrading from AGM or lead-acid to lithium is actually worth it. The short answer is yes, for a lot of saltwater boaters it is. But it helps to understand why....