I am a heavy vaporer (vaper?) and while my batt (AW Black) is only a week old, I am getting a solid 12 hours from it. It lasts longer than that, but 12 hours easy of good vapor. Yesterday I started using it at 8:30am and put it on the charger at 11:30 pm..........not dead, but getting weaker. Same today, but it's now midnight and still using it, but it's time for its' nightly charge.