Built-in Diagnostics - Diagnose bad batteries or problems with your vehicles charging system in your own garage with the SC1325s built-in battery and alternator testerFully Automatic - The Schumacher SC1325 automatically detects 6 volt and 12 volt batteries and when the battery is fully charged, the unit automatically stops charging and shifts to maintain modeAdvanced Charging Algorithm - Multi-stage charging on the Schumacher SC1325 battery charger employs an advanced algorithm to maximize battery charge, health, and lifespanReverse Hook-up Protection - With advanced reverse hook-up protection, the battery charger protects against damage if the clamps are not properly connectedHeavy-duty Construction - The SC1325 features metal casing, solid wheels, and sturdy battery clamps for a unit that easily withstands the toughest use