Quark 4-slot Charger SpecificationFor Quarkcell AA battery only Model CG1640AX Input voltage 12 Vdc Charging slots 4 Charging voltage 1.65V~1.68 V Charging current 4A max. Lights indication Power on GREEN Charging RED Fully charged GREEN Quark-AAAA-ChargerQuark-AAAAAA-Charger