The Schumacher SC1393 6/12V Fully Automatic Battery Charger and 12A Maintainer is microprocessor-controlled to automatically adjust the amperage rate to charge and maintain, with multi-stage charging for added precision, safety, and battery life. Charges compatible battery types, including standard and AGM batteries. Reverse hook-up protection ensures charger will not operate if clamps are reversed. Float-mode monitoring automatically maintains optimum battery charge. Auto-voltage detection automatically detects output. Meets the highest industry standards for energy efficiency.