I connected a apparently flat charge wet cell and a dry cell 12volt .Both these units had been placed on charge before on an old unregulated charger with very poor results ie. went to a residual voltage within a few days. The Optimate recovered both these units to a full charge which they have now maintained.It took a couple of days but the results were worth the wait.I now us it to maintain my Jetski and motorcycles..rotating between them. All in all a great product..
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