Greetings; I have an innokin iTaste MVP 2600mAh Box APV, but it never has gotten more than about 250 puffs max. (It's not a V3...oops). I charge it using the cord that came with it. Charging via USB seems to give it a better charge than plugging into electric socket. Just seems like it doesn't last all that long. I now have a 1.8ohm, and firing at 3.7v. How many puffs do you get with yours?? And how many puffs should you expect??