I know 3.7 is the nominal voltage, but once I get down to 3.7, the vape is too weak for me and I swap out. Of course, I could build lower, but then 4.2 is too much. LOL anyone else like me in this regard?
I don't measure it, but the vapor production and warmth on my setup (reo grand with Trident v2 at .41 ohms) drops off considerably, and that's long before the danger zone. I did go really long on one battery without realizing it and popped the dead one in my flashlight (which holds my spare battery and is 18650) and the light dimmed automatically because the battery couldn't keep up. That's the only time that's ever happened