A regular battery will droop in voltage under load , so you are really vaping at 3.2 -3 volts NOT 3.7 volts with out regulation.
Hey Buzz, I have an atty that when I bought it they said to NEVER go over 3.7 volts. So when I have the IPRO on 3.7, with the atty on, is that actually 3.7 or can I turn it up a bit?