I had a question, i recently thought my attys were dead, but it turned out that they just didnt work with one of the batterys. I have blu batteries with m501 attys, and the one that doesnt work says it is fully charged, and the tip lights up when drew on, but no vapor. If I plug in the other battery, then the atty works fine and produces regular vapor. Sometimes when i plug in the battery with the usb charger, the light is both red and blue on the charger. So I was just wondering if anyone had an answer for this.