I have bought a couple of mods from Shan B of VAPECORE.com and every one is just great they are VV at there best.Vape up to full battery charge of 8.4 volts if you wanted to. ,I own right now 1 14500 mod that lasts easy 1 day of my vapeing of about 5ml and I own 1 18560 VV mod that with IMR's in it last me easy a day I run it with AW IMR's at 1600mha and 2000mha batteries. Shan has got the VV mods worked out and they vape like mad tons of vaper with single coil carto's or dual LR carto's or any addy you want to put on them. And Shan makes them custom just for you if you want. She can be out of stock at times but she is a one girl show and a mother but loves what she does and does a great job of them. I have just bought my 3rd mod from her and hoping for it this week and have 2 more on order as customs. You can check out her web site at Shan Mods @ VAPECORE.com or on facebook. She is a very friendly girl and willing to answer any questions you may have. So if this is what you are looking for a VV mod with 14500 or 18650 batteries then check her out You will not be sorry.
I use these. Holy moly.