Plug the charger into a USB power source and fasten the "atomizer-end" of an Ego Series battery to the charger. The battery LED will flash several times indicating a good connection with the charger. The charger light will turn from green to red if a charge is needed. The charger light may flash during the duration of the charge. Charge time varies depending on the size or capacity of the battery.
Green Light: No battery attached or the battery attached is fully charged
Red Light: Charge in progress
Output: DC 4.2V 420mA