What is the best 18350 battery in the market?
Tbh like I said, idk much about them. I just came across a site the other day discussing sub ohming using 18350s and the LiFePO were mentioned. I've been through my history folder but I can't find it. Really annoying actually bc I usually bookmark everything I find useful. But there must be something to be said about them because Nitecore have added the ability to charge them with their Intellicharger.mm, very nice to know. I guess i will have to get a couple. If they can run or fly, they sure should be able to vape.....

Partly to sub ohm safety. Lower capacity lipos can also perform as long as their higher capacity counterpartsThe Efest IMRs I am using are rated at 800 mAh and the way they perform suggest that they are 800 mAh batteries.
Why drop down to 500 or 700 mAh?
I'd repeat that I'd say that you'd only really buy them if you want to sub ohm safety in a 350 mode
http://www.zikwid.com/Tenergy-LiFePO4-RCR123A-32v-750mah-2-Pack_p_437.html