I was so excited when I first saw these batteries some years ago. What I have learned:
- Horrible quality control and service. There are some vents on the top that would fail, and their customer support would take ages to respond.
- Hard to find distributors. Have you seen these batteries in any stores or on amazon? Or anywhere? Neither have I.
- Great low temp performance, but its still heavy. At the given price point, and with shipping costs, I would go with lifepo4.
- They like to die for no reason. And again, horrible customer support.
So they look good on paper for a lead acid battery, but I would avoid them like the plague if I were you guys. Still a heavy, expensive, lead acid battery. Google search peoples experience with them on the marine forums. Lots of stories.