All Powerhouse Lithium chargers are designed especially for LiFepo4 Batteries and all have auto shut down so you do not have to worry about over charging. All chargers carry a one year warranty. Run & Gun Chargers are designed to run on the water and off the water. Using your existing 12v on board charger with at least 10amps per bank. (scroll down to bottom of page on Run & Gun Chargers to see how it is configured (Click here for link)).