okay so i went ahead a got a 7s ecig and to me there perfect for my needs, haven't smoked a cig in 4days or so. (one today because i ran out of cartomizers) i have been searching for cartomizers that would fit my 7s micro battery i've read the m301 but i could be wrong. to me the cartomizers from my7s are a bit pricey. if anyone got some info please help, im trying to order some today!