Love to get opinions on estimated battery life for both imr 18350/&18490 3.7vbatts. Using on mini Provari- 2.0-3.0ohms @ 3.7-4.7v. I am a medium vaper. Just want an idea on hrs. of battery life. Any experiences you could share would be great! Wondering how much of a difference the Prov2 would be vs. the mini I decided on.