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Message: <blockquote data-quote="Buster" data-source="post: 500539" data-attributes="member: 27745"><p>What you've heard is correct. The reason is clear in my earlier post with the discharge graph.  Simple voltage meters work by measuring voltage of the lead acid battery.  The voltage curves are different for different batteries.  There are numerous battery meters available.  I use the Victron SmartShunt and it's great, although expensive.  Make sure you get a waterproof version or have a safe location in the boat for it.</p></blockquote><p></p>