Charge, maintain, or jump start 6V and 12V batteries with the CEN-TECH™ 200 Amp, 6/12V Wheeled Automatic Battery Charger with Engine Jump Start. A built-in microprocessor automatically switches the system from charging to maintenance mode to prevent overcharging. This portable battery charger has 2 to 40 amp charging rates plus a 200 amp engine start with longer boosting power. Fan-cooled for longer service life, this battery charger is ideal for automotive enthusiasts.