Charging will keep flashing. The reason why the red light of the juicing cup is flashing is that it is not fully charged yet. When fully charged, the green or blue light will turn on. The white light flashes to indicate that it is stopped during charging. Turn the juicer cup cover downwards. Charging time should not be less than three hours. When the red light is on, it means that the battery is low. When the green light is on, it means that the battery is fully charged. It takes three hours to charge for the first time.