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The 12-Volt 1.25-Amp Battery Tender Plus High Efficiency is a battery charger designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers. It has a complete four-step charging program-initialization, bulk charge, absorption mode and float mode. IThe charger automatically switches from full charge to float-charging mode. This charger is sparkproof and reverse-polarity protected -red and green lights alternately flash in this condition. Included are a quick-connect ring-terminal harness for hard-to-reach areas and alligator clips for an alternate connection. This unit replaces the 021-0128 in the California market.