This Battery Extender powered by Schumacher is excellent for charging and maintaining all power sport, car and boat batteries. Automatically detects and charges 6-Volt or 12-Volt batteries. The charger is rated for batteries up to 600 CCA. Microprocessor controlled - automatically adjust the amperage rate to charge and maintain battery Multi-stage charging for added precision, safety and battery life Charges compatible battery types - standard and AGM Reverse hook-up protection - charger will not operate if clamps are reversed Connect it and forget it - monitors and maintains the battery when fully charged, resumes continuous charging when battery becomes discharged Energy efficient - meets the highest industry standard for energy efficiency