That's just a function of which battery and which Atty/carto you're using though...remember at the end of the day, no matter how nice they are a mechanical mod is a battery holder. they don't produce power on their own. A 10440 simply isn't going to equal an ego in battery life or wattage...that's the trade off for size.....the closest direct match for an ego as far as mods was/is the S6 or a 14500 battery.I thought in the beginning (2 years ago) that I had to have a very powerful ecig, but I learned I really can't handle anything more powerful than what an eGo puts out, which I consider very good. I'd like to see David re-do his P-10 to simply put out at least the power of an eGo (3.7V?) and I'd buy one in a heartbeat.