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Message: <blockquote data-quote="airshot" data-source="post: 508696" data-attributes="member: 1183">From my research and discussion with local battery engineer, using the engine to charge Lifepo4 batteries is not a good idea.  To many comolications could arrise.  There is equipment availiabke to allow that to hapoen but it is new and not thoroughly tested.  For my own piece of mind, when I replace my trolling batts with lifepo4's they will have their own plug in charger while in storage. My outboard only charges the main starting battery, the house battery has it's own charger.  The onboard chargers are all wired to one plug, when boat is parked, it is plugged in. Over the winter, I have maintainers for all the batteries. Been using this method for all my boats over the past 30years with not one issue.  Will need to reconsider a couple things when my troll batts are upgraded, but for the most part, using your outboard to charge should be restricted to just the start battery only.</blockquote>