I'm confortable with anything between 26 mg and 36 mg. 32 mg seems to be the sweet spot but I have to find 36 first and then cut it with vg. Big pain. Cignot is the only reliable source I use for VG Dakang juice and they only go to 26. It works fine but I vape a bit more than is convenient.
Tib, I just sort of glanced at the thread... First thing that came to mind was "if it sounds too good to be true...". I'll be interested in hearing your report. The page I scrolled through was pretty much one guy hyping it hard (I've seen that happen before

). It's apparently dropped in half on price? Could be a reason for that... maybe it's just the form factor. CR123's are about the same diameter as an 18650. Connector type?
CR123 is a form factor. Most are Li-Ion. Some are lifepo4? Different chemistry can be approx 3v or 3.7v (a Li-Ion cell is a 3.7v nomimal). They also have some (Tenergy) 3.7v Li-Ions that are regulated to 3.0v. Is that what you're asking? You do want to make sure the batteries you use are protected batteries. That they have a circuit that will cut them off in case of short, over max discharge rate, or under charge.