The Schumacher SC1300 1.5A 6/12 12V Fully Automatic Battery Maintainer is great in cold weather for maintaining 6V and 12V batteries. This unit is microprocessor-controlled to automatically adjust the amperage rate to charge and maintain with multi-stage charging for added precision, safety, and battery life. Its float mode monitoring automatically maintains optimum battery charge. Auto-voltage detection automatically detects output. The reverse hook-up protection ensures charger will not operate if clamps are reversed, as LED indicators will flash.