Just got my new screwdriver in a few hours ago. Immediately plugged the batt in to charge and finally got a green light. Filled the thing exactly as in the how-to video on TW website, after 4 puffs, no vape, no sound from the atty. Switched attys since there were two in the box, same thing: after 4 good vapes (well at least vapor producing, getting more vapor from an auto-batt 510), no vape, no sound from the atty.