I got my first vaporizer kit in the middle of May, and it worked great until a couple days ago. For the last 2 days I tried charging it through USB ports on my laptop and with my car charger and 2 wall chargers. One of my wall charges is a 2 amp charger for my Samsung note 2 which uses a 3100mah battery. Now the spinner will be plugged in for hours even over night and will not fully charge, and at times when charged for an hour I might get 2-5 puffs at 3.3 volts. I also been charging it at 4.2 volts and cleaned the contacts on the spinner and on the dongle charger. I also tried a different charger both rated at 420mah. Any advice? TIA