I thought that my Provari would be the "end all" to my search for a perfect PV. It would have been it...but, battery life is horrible (4hrs at the most with the extension cap and an 18650 battery), you can only use High Drain batteries (they don't offer anything higher than 1600mah) and it errors out with true LR attys and cartos (so no dual coil cartos!). Ok, all of that being said, I'm looking for a 5v mod (no box mods), 510 native, that has great battery life. Doesn't have to be variable voltage (but not saying that it cant be), I've found that 4.5-5v is my sweet spot. Any suggestions?