I started with a SmokeStik (4080 battery and cartomizer) and like it... I can carry it in a shirt pocket discreetly... I like the cartomizer and have been refilling them without an problems... I don't like the battery life, just too short... And, I can go through a 4080 carto in a couple hours... I am looking for something that last longer, battery wise... Uses a cartomizer, holding more juice would be a big plus... I need something that can be carried very discreetly in a shirt pocket, pen style I guess... What animal am I looking for??