I have been using the DCT 5ml from madvapes on my ego mega B. It comes with a prepunched 1.5ohm carto. I tried that for a day or so and it seemed to drain the bat quite a bit. I also heard the 1.5 could hurt the bat. I purchased a couple of prepunched 2.0 cartos at the same time I got the tank and they are much easier on the bat but they do not hit as well. The 1.5 had a great vape. The 2.0 are not bad though. I also ordered a couple of 3ml 1.5 ohm DCT's from madvapes and when I checked the ohms they were 2.0. I am not complaining though. They sent me a couple of free bottles of juice with the order and I am switching to the 2.0 ohm anyway. I have had no problem with the tanks leaking. I am satisfied with the purchase and I am planning on getting a couple more of the 5ml's.