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It officially died. Grrrr. I followed everyones revival tricks with no avail. Thank God for back ups. You won't catch me with my pants down.

I would go with the 3V. The 3.7V will give you over 7V of vaping power which is overkill and a definite atty killer

A decent vid. A few observations from what you posted. In your first demo with the Mark Mod (a 14500 I assume) the unloaded voltage of 3.98V would indicate either a not fully charged cell, or a problem with the Mod itself. Raw cell voltage and unloaded mod voltage should be almost identical, maybe a 0.02V drop... tops. I'm assuming the meter is fine from your later USB adapter voltage test. Any time someone builds a basic battery mod, box, tube, flashlight etc. the raw cell to unloaded mod volt comparison is important to make sure there is no unwanted additional resistance being introduced. What that test shows quite clearly is what a poor choice the typical 900mAh 14500 cell is at 1.5Ω. Part of the problem is that they are nowhere near 900mAh at high amp loads. And mAh are related to how much current they can supply. Here's a test, with a usable range. 4.2 - 3V at a rather light (by our standards) 0.8A discharge. The verdict? The 900mAh UF14500 is actually 592mAh. And that's at .8A, a LR atty wants 3 times that amount which means the mAh will actually be lower. In your test @ 3.3Ω you had 3.61V loaded. Folks should realize mAh's play a huge part in performance, not just vape times. Here's a loaded test by Rocketman. His meter is quite accurate. The cell is a freshly charged 18650 UF3000mAh (OK for low current demands like this, for LR use look elsewhere). Here he is firing a carto that he metered at 3.2Ω. Sweet. Your PT test with the 2A PS was interesting. It shows that a 2A power supply does not guarantee 2A to the atty. I may be old school but if it's a 510 PT I want to know how it works with the real deal, the Joyes. Extrapolating from your test results/drops a Joye atty user (510 or 306) would be at ~4.2V (maybe). It would have been interesting to see how a 1.5Ω load on the PT would compare to your first 14500 test.

I smoked 1-2 ppd for 27 years and the model that works best for my needs is the eGo with mega Atty. It has a great battery life and with the mega addition you only have to fill a few times a day. Good luck!

Hi Tag. You have a good starter kit. A good unit to step up to would be the eGo/Tornado. You will be able to use your 510 attys on it and the battery life is much better than your standard 510 kit.