I NOW HAVE TWO IQ3'S, I HAVE ALSO PURCHASED 21700 BATTERIES FROM ANOTHER VENDER. THE BATTERIES I PURCHASED FROM ANOTHER VENDER LAST ABOUT 30 MIN MORE THAN THE ONES THAT COME WITH. THEY ARE MUCH BETTER THAN THE MIQRO C'S ALL THE MIQRO C'S DO IS CHEW UP THE BATTERIES, CANT EVEN GET 1 HEAT UP SOMETIMES AND IT DRAINS THE BATTERIES, TERRIBLE PIECE !! I HAVE 4 OF THOSE , HORRIBLE VAPORIZERS. I HAVE 8 0F THE ORIGINAL MIQRO 'S AND THEY ARE GREAT. FANTASTIC PRODUCT. I THREE IQ2'S GREAT PRODUCT. THE IQ3'S ARE SO FAR A SUPER PRODUCT. THE MICRO C'S ARE TERRIBLE!!!! THANKS