i got my mflb today and tried it but its not producing vapor. i first thought it was the battery so i charged it for about 30 min to a hour and the charger went a solid green LED, so i took it out and tried again, with both batteries, no vapor. i put the batteries to charge again and the led is now blinking again despite me attempting to use the batteries for a couple of seconds with no successful result. can someone explain how this LED thing works? I thought that a solid green LED means that the entire battery is charged up..