About 3 weeks ago I got a new Jacvapour kit with auto batteries of 900mah. I immediately filled one cart and one mega cart and tried it out. Unfortunately they didn't satisfied me unlike the kit before that I purchased from the same .I use to have auto batteries before ,the slim ones 180 mah so I thought these will last me more time to charge and in fact they do but they are not that good in their work, when I take a drag I can hear air leak and no good drag. I tried to close one hole on the battery and it worked for some time but then it started again. I tried as well to close some of the holes on the cartomizer but still it will take time to fix here and there till you get the good drag and as the product is still new I don't pretend that I have to make all these things. Anyone have any idea on what this could be? I tried more than one cartomizer on these batteries and still with no success, but when I place the same cart on a smaller older battery like the V3i 180 mah they work fine and give a good throat hit.