My Vamo v3 came in yesterday. It came with an iClear 30, which I did not particularly care for. I've found that for my Vamo and Lavatube, a Kanger ProTank works best. It gives great performance with very low voltage (3.4-3.8).
I had several mini ego type batteries but the eGo Twist is my go to when I'm on the road. I use the mods at home and take my eGo twist everywhere. Its well built and despite the twist on the bottom, its hard to accidentally change the voltage.