AW IMR would be the brand I would recommend. I contacted Efest directly and all they would tell me is that their batteries have between an 8c to 10c rating. 8c meaning 8x more than capacity and 10c 10x more. So their 800 mah would have a max discharge of 6.4 amps to 8 amps.
If you take a look at the site. It has many different batteries.
Flashlight information
As far as teaching, I do have a job where I have to teach patients about medications and procedures. I don't have to be professional here, I don't get paid for it.
Just saw that you edited your previous comment, and I wanted to say, my bad. I understand where you're coming from now and the fact that this new craze of Sub Ohm ing requires extensive knowledge in the topic before attempting. I just read a couple of other reads on the dangers of Sub Ohm ing as well as the fact that newbies are attempting to Sub Ohm with no prior knowledge.
As I stated before, one of my friends has that 0.3 coil on a Nimbus, I am still at the beginning stage of RDAs/RBAs and will now understand the specifics and safety precautions needed before attempting anything, "just for clouds."