? about vv devices

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bbrian7

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Sep 27, 2013
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whats up everyone im new to the world of vaping and loving it .so probably a simple explanation but something thats not making sense to me. i have a itaste vv it gives me a digital readout with a range if 3.3 - 5 volt that i can adjust thru and vape at ok what i dont get is if my device only charges to 4.1 volts how can it produce a 5 volt setting to vape at ? or does the 5 volt setting not really 5 volts but just the max the battery can dicharge at from its current charge.also iv seen mention of not to stacking dual batteries in mech mods and then iv seen people who do so is this done to then achieve a 6 or 7 volt vape?i do intend on getting into some mech devives in the near future so just trying to figure this all out thanx
 

IMFire3605

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May 3, 2013
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Yes, most Variable Volt, and Variable Power (Variable Wattage) devices have an internal amperage booster circuit to give the a kick from a set voltage on a battery, similar in terms and basically principle of connecting an amp to a radio to push more powerful speakers. As far as Mechs, for now I'd suggest you steer away from them until you get some experience, also studying and grasping the concepts of battery chemistry, output limitations, what stacking batteries can do and inherent dangers of doing so are, as well as the concept of "Ohm's Law". Personally I would steer clear of stacking in a Mech when you get to that crossroad, can always add a Kick/Kick2 booster to a Mech to up output, Mechs have their place and may seem simplistic to you at the moment but they any of the built in safety features a digital regulated battery or system provides. I purchased my first Mech couple weeks ago for dedicated dripping and Genesis style attachments, and that after going on 7 months dedicated vaping before I felt I was ready to use one properly, then again I have a resetable fuse in it as well as I am not going anywhere near 1 ohm or below.
 

AttyPops

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Jul 8, 2010
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See above for the boost info (you trade extra amps for more volts).

As to the stacking thing...

"Stacked" batteries (two or more batteries end-to-end in series) add their voltages together. There's problems that can occur with the setup though and it's why many don't recommend it.

Basically voltage adds, but amp limits don't. Voltage is "oomph". Kinda like water pressure. (it's potential difference between poles...the more difference, the higher the voltage and the more the electrons are encouraged to move.)

So two 3.7 volt batteries each with a 4 amp limit (that limit varies depending on type) when stacked give a 7.4 volt power source with the same 4 amp limit. Now, If one battery in the set is mostly discharged and the other is fresh-charged, and you try to push all that charge through the imbalance, particularly for high loads, the imbalance can overheat one faster I guess. Or lets say you short the atty connector and the button gets stuck or you forget to lock the button, put it in a pocket/backpack/car storage box/whatever and the button gets pressed and the coil shorts. Any short will stress BOTH batteries quicker due to voltage being higher...and a short is 0 ohms or nearly so...so it's by definition over any battery's amp limit.

Basically even a single battery shorting is bad. And two in series is double bad. ;)

The batteries can "vent violently" in some cases. That's why we say to use protected Li-Ion batteries. Other battery chemestries are safer...like IMR...but they can still vent. There's a thread around here with a guy who's IMR battery vented and expanded way out in his backpack.

So the "danger" with stacking batteries is that it's just a little bit easier to have a more serious venting issue with two batteries in the same mod. The extra voltage pressure helps to...exacerbate... the already bad-news short situation. Batteries should be "balanced" and checked. Etc.

This should give you the general idea. I'm not really an expert. But you can google "battery university" for more info. Here's a link:
Basic to Advanced Battery Information from Battery University

I should say I stack batteries in my box mods all the time. This is NOT a mech though. It has a regulator with over-current protection. And I use protected batteries each of which has over-current protection. So I have three layers of protection in series. And box mods I use can't build up pressure (the backs just slide off).
 
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