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Doesn't know when to stop... charge voltage too high for seal lead acid. The circuit acts like an unregulated voltage booster with some sort of peak voltage sense/cutoff that never hit it mark. Used it to charge a group U1 35AH seal lead acid in the tongue box and the battery read 16V and gurgling when I disconnected the charger. Perhaps this was meant for flooded lead acid? I'm not sure, but it didn't work for my application.