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Message: <blockquote data-quote="Still Afloat" data-source="post: 513416" data-attributes="member: 32426">More than likely, they were using a battery that wasn’t designed for the starting current surge.  Plus, they won’t fully charge from the bike’s (or an outboard) alternator system and need to be topped off occasionally on a the correct charger.   There are Lithium batteries that are designed for starter applications but, I would not expect the same lifetime as a LifePO used as a trolling motor or house battery. This is an abusive application.  Having said all that, I use a Lithium starter battery for my small outboards.</blockquote>