My first Leo battery can with a kit and it lasted a full year. Every single one I have ordered since has died a premature death, and this last time I ordered two batteries from E Cig Arsenal and the first one died within a week!!! I am using my second one now and will let you know how long it lasts. I have heard there are bad "batches" but this sucks, and I can't afford to treat my batteries like cartomizers. Any one else have this problem: blinks three times (green) and then the button/switch gets stuck, unable to turn on again.