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One of my hangar friends at the airport showed me his pulse technology battery tender. He says it brings life back into tired weak batteries and prolongs the life cycle of healthy batteries. Claims to de sulfate the lead plates within the cells by way of minimizing the size of lead sulfate crystals. So being a tool geek I ordered one on Amazon, about $72, and received it today. I will try it on a Concord AGM battery I pulled from my Pacer recently because its was not cranking the O320 very aggressively like when new.