BatteryTender - Battery Charger 10 Port12V or 6V switchable @ 4A AGM Standard or GEL Lithium 12V only Iron switchable To avoid dangerous dead short sparking, microchip circuitry will not activate output voltage until clips are correctly connected to battery. Simultaneously charges and or maintains up to 10 batteries. Maintains batteries at full charge. 4 amps per output charging current. Clamps included. Safety timer: 25 hrs. AC Power Cord Length: 6 ft. 16 AWG DC Output Cord Length: 10 in.