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Message: <blockquote data-quote="ttocs" data-source="post: 930934" data-attributes="member: 11896"><p>setting them on concrete "should" not drain them, you are correct since there are no connections made to it.  How ever once it has been deep cycled a few times, and becomes damaged then it CAN loose voltage just sitting there with nothing connected.  This happened to my last battery in my truck that was less then a year old.  My alarms battery went bad and was dragging the main battery down and kept killing it in little more then a week.  After the 3-4 time charging it, it would then charge up as normal, test out as good but if you just left it there and came back a few hours later it was a few volts short.  It can happen and does...</p></blockquote><p></p>