My every day vape is a ProVari Mini, which uses one 18350 800mah 3.7 volt battery. My average voltage is set to 4.0, but I'm only getting about three or four hours of life on every battery. Therefore, I have to carry around l
Are those Efest IMRs by any chance?
I've been using only AW IMRs for well over a year now in all of my mods. A couple of months ago, I was making an order for batteries for my daughter's new mod, and decided to get a couple more 18350s for my Mini Provari, too. For some reason I decided to try some Efests. My daughter got 14500s for hers mechanical BB.
With both of us using the new batteries in a rotation, in our respective mods, the Efests compared favorably with the AWs we had been using. However, after 2 - 3 weeks we both noted a gradual decrease in battery duration. Nothing else had changed. She claimed she was only getting 3 - 4 hours on a 700 mAh battery. I honestly don't remember what I was getting on my 18350 Efests, but I did notice a drop in battery life.
We both ended up putting the Efests away in a drawer and went back to our AW battery rotation. Not all batteries are created equal.
Just sharing my personal experience.