Whats up with box mods?

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Evelson_III

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May 30, 2015
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Hey all, not a new vaper by any means but I suppose I've finally come up with a couple lenghty enough questions that facebook groups probably dont need to see or be bothered with.

I'm getting my first full mech box soon and from what I hear they might need to have a little bit of thought put into battery selection and build setup and what not. From the electrical knowledge that I have come to understand, anything, in this case a mech box, that runs it's batteries in parallel has a compound amperage rating of the two batteries, whereas a box in series would have a compound voltage. Using two 3.7 volt batteries with a 30 amp continuous discharge (vtc4 for example) in a parallel box would have a 60 amp cont. current available at 3.7V to the coils, whereas in a box in series you would have a 30 amp current at 7.4V to the coils. Yeah, fresh batteries are going to raise those numbers to 4.2 and 8.4 respectively, but is this all cool and correct so far?

Having played with a a couple VV and VW boxes, I like that I can make a laughably big 20 wrap dual coil build and have it fire up like nothing. Having been with mech tubes for so long, different amp batteries are a thing I have been playing around with but want a confirmation on my suspicion, does putting a higher amp battery in something mech have a similar effect like upping wattage? Along those lines...

The box I am getting runs batteries in parallel with a bus bar style positive, so I have the option to run one battery and stick to all the rivers and lakes that I'm used to, but if I am to use it to its potential and threw in two 30 amp batteries, would building a much larger coil with something like 14 wraps instead of 6 create the resistance needed to not A) fry my cotton or B) set it on fire, and still keep the overall general temperature of my vape down below and in a safe level, or would the extra amperage just allow me to build some coil art down to 0.stupid and still be relatively safe, or are all of these thoughts irrelevant entirely?

Now if I am to use this same box with 2 15 amp or 20 amp batteries in it instead, would I be fine doing a regular 0.3 or 0.2 ohm build and just have the extra MaH time?

Let me know whats up,
 

Bunnykiller

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the parallel battery configuration does "double" the amp supply while keeping the voltage at the single battery level ( e.g. 4.2 max).
In effect you can make builds that can draw more amps ( lower ohms) but keep in mind tho, if the batteries are not matched, one battery will take more of a beating than the other and develope "issues"... as far as building larger coils, you need to take into consideration the increase in ohms ( unless you go to thicker wire/lower gauge to offset the increase in ohms)
 
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Robert Cromwell

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Having played with a a couple VV and VW boxes, I like that I can make a laughably big 20 wrap dual coil build and have it fire up like nothing. Having been with mech tubes for so long, different amp batteries are a thing I have been playing around with but want a confirmation on my suspicion, does putting a higher amp battery in something mech have a similar effect like upping wattage? Along those lines...

Not exactly it ups the wattage your battery can SAFELY handle but the wattage using a mech mod will be determined by the resistance of the coil/s.
 
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Cool-breeze

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Your presentation of parallel and series batteries is correct. Batteries with a higher amp rating mean you can safely build lower ohm coils (ohms law) or to say it another way those batteries will not give you more power but allow you to draw more power which is unlike how VW works. The rest of your questions can be solved with ohms law. Not trying to brush you off but I believe there is merit in solving those questions for yourself. However feel free to ask me, or anyone, to double check your math.
 

Evelson_III

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May 30, 2015
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Cool, thanks for all the replies. So if I gathered this stuff correctly, the increased voltage in series allows for the huge coils with dozens of wraps, whereas in parallel I have the ability to run a coil with a bunch of different strands of wire in it.


And just off the top of my head, In said parallel box, with 2 30amp batteries my safe limit would be down to about 0.07 or 0.06 yes?
 

Evelson_III

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The information I have is that two batteries in parallel gives you approximately 70-75% of the joint amerage. Two 30 amp batteries = 40-45 amps. I haven't tested it but I have reason to believe the information is accurate.


I'd believe that too given the added wiring and interruption. That makes me curious if the location of where a circuit is broken changes the performance at all
 
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