I'm not sure which model you use but after making a few NicoSticks with the 900mA 14500 batteries (I only vape at 3.7 volts) that last me an average of 7 to 8 hours I got spoiled. I got myself a couple of 18650's at 2400mA which you can get at 3000mA and built myself a simple mod out of a small Altoids tin. I've only finished it yesterday and it works perfectly but don't know how long a fully charged 18650 will last yet. I'm guessing a couple of days anyway.
It really is a pretty simple mod to make for yourself.
You can see my "Altoids Mini"
here.
