Hmmm might be a dumb question but what is the significance of it firing at 3.7 versus 3.4?
You'll find that there are literally hundreds of e-liquid flavors. All these flavors might taste slightly better at a different voltage, hense the recent popularity of the eGo Spinner and Twist variable voltage batteries. Each individual flavor might have better flavor vaporized at 3.4 volts, or 3.7 volts, or 4.0 volts, or up to 5 volts. "Fixed voltage" batteries only output a single voltage when fully charged, and then gradually output lesser voltage as the battery is drained during use. So you may not realize the full flavor potential of a juice with a fixed voltage battery.
For example, I have fruit flavors that taste best at 3.4-3.7v, coffee flavors that taste best at 4.4-4.8v, and a cinnamon flavor that tastes best at 5.4v. I use a variable voltage PV that allows me to adjust the voltage on the fly for whatever flavor that I put on it.
Depending upon the ohm rating or resistance of the heating element used in the delivery device, low voltage batteries could mean less vapor production.
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