Huge off topic, but:
If you want good battery boxes look here:
http://www.e-cigarette-forum.com/fo...oltage-evercool-quality-look-great-price.html
I have 4. battery boxes at this moment (2. of them built by myself) and all models with switching regulation are one of the best i tried. You also need voltage display, without it you will never know what is the best voltage for different types of cartos/attys and different e-liquids.
V8 does not have switching psu, it has pulse, similar to akston hughes for example and this is best power supply for vaping. And it is cheaper and look nicer than any hand made battery box.
Penguinrudder: if ultrafire battery works in V8 use them and don't worry. Because they are little taller only possible problem is that you can brake battery holder, but i don't think that 1mm can make difference.