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CTEK's latest model is the MUS 4.3, which has an eight step charging/reconditioning process that can solve many battery problems, including deeply discharged flooded batteries, sulfated batteries needing reconditioning, AGM specific charging, a winter charging mode, and more. Like all CTEK chargers, the connections are spark proof, reverse polarity protected, and short-circuit proof. You can literally clip the clamp on leads together and nothing happens. No sparks, no arcing, no blown fuses. Try that with your old bench top charger.