I've tried 9 different type of cartomizers, and imo, the 2.0 ohm Boge's are the best on my xpower 900mah (with adapter) and my egotist 1300mah bats. They're pretty cheap from litecigusa.net. They wick well, have no filler taste, never leak, hold a lot of juice, and won't hang on to it like some. I've had a run of bad luck with carto's, so I'm sticking with Boge's. Just my opinion, and I know everybody's got one! lol I wish I knew this before I spent a fortune!