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This is a Genuine BMW battery charger, identical to the one you would get at a BMW dealer. The alligator clips allows it to be compatible with all current BMW models, including the E90 3 Series, E60 5 Series, 6 Series and 7 Series. The BTP micro-chip technology (the control unit of the chargers) applies the correct peak charge and then automatically maintains the battery at the perfect float voltage. The unit, is a 1.25 amp battery charger designed to fully charge and maintain any type of lead-acid battery at a proper storage voltage. 6' power cord.