Hi marine,
I have a smoketek vv varicool box mod and absolutely love it. I will never go back to stock batteries such as ego which I have used.
The difference is night and day in vaping performance. Not to mention when your atty starts to underperform, on the box mod you can just turn up the voltage a little and squeeze more life out of it!
The box mod may not be pretty or sexy, but it performs like a champ and is very durable. I bought mine last may, dropped it more than I can remember, have sat on it, even melted two Vivi Nova, my fault for not turning safety switch off.
They now offer a 6 amp model which I will be ordering soon. If you get one, you will never look back at stock ecig batteries. Good luck!
