Good advice on the toothpick trick. I've been wondering what the best way to plug one of the holes was.I have found that the airy draw also comes from the cartomizers. I have had batteries that have an airy draw and when u change cartos, it's not as airy. I believe it has to do with the threads and how the air holes line up with the carto slot. I have 3 suggestions.
If the battery seems to be the cause, try taking the carto off and then blow into the battery for a second or two. When you stop blowing, you will see the led light up and stay on for 7 seconds. This gets any air pockets out of the sensor.
Second, try unscrewing the carto just a touch, this makes the air holes line up differently with the carto.
The third is what I do. Take a toothpick and push the tip into one of the air holes on the battery, and break it off, leaving the tip of the toothpick in the hole. This will "clog" the air hole and give a harder draw. It works every time. I have asked IMAGINE about it and she said it will not hurt the battery.
For the record, I have experienced this on batteries from several companies, not just the volt
In my case it is not the carto's either. I can switch the same carto between my 3 batteries and all 3 will have different draws with that same carto.