Hello I've been vamping for about a month and I have learned a lot and upgraded a bit since my first hdvape starter kit I have an evod single coil and a mini protank 3 and a mini nautilus witch is the best tank I have tried to date it came with the bvc I currently have a clk1280 as a power source and I'm just starting to get into dripping bought a itaste vf rda a couple weeks ago and I finally was able to build a proper coil wick combo that works my question is what do I need to power my rda a mech mod a box mod battery's in mech are only 4.2v ? My clk goes to 5v so died that mean the mech will just last longer because it has double mah I'm confused