Vv box mod question

[ruff]

I've seen many posts around here about vv mods, what I'm looking for is a vv that will last roughly 9+ hours without multiple battery changes or charges. Now on to my question, would a 2x14500 be the go to on this or would I need to step up to a bigger set of batteries say 2x18650 or similar? Any guidance will be greatly appreciated

I vape between 4 and 6 ml a day if that helps any

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[proax9]

I do not own one- but heard good things that the Big Brother Vari-Cool which uses 2*14500 batts- will last 8-7 hours.
Alot will depend on vaping style, ohms on cart/atty and the voltage you run it at.

 

[harmonic]

4x 14500 ICR 600mah (high drain) parallel into a ti ptn04050 booster with a 1.5ohm dual coil at about 4.5v will last me 2 solid days usually if i wait for the batteries to cut out before i change them.
got one that takes 2 batteries but it had a short until yesterday so I dont know exactly how long 2 would last. it also depends what resistance carto your using...
hope this helps some

 

[VpnDrgn]

Unless you vape really heavy, two 18650's pushing a 4050c booster should last
more than a day ( if not 2 days ) easy. It'll be a little bulky, but not as bad as
four 14500's. There is an enclosure on Ebay made for two 18650's that
a lot of people have been using lately.

Like this one.

 

[ruff]

Now see thats why so many people love this place, always people willing to lend a hand and rather quickly to boot. Thank you all for taking the time to post, that enclosure looks about the right size for me I dont mind the extra weight as long as I can "dial-a-vape" from what I've been reading vv seems to be the way to go

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[jmanning]

Two 14500 in series with a switching regulator like the TI, OKR/T, or SWAJ3 will last me 8 hours

 

[WillyB]

Two 14500 in series with a switching regulator like the TI, OKR/T, or SWAJ3 will last me 8 hours

How about putting that in terms of liquid used?

Obviously some will vape 2ml a day others over 10ml.


@ ruff

I vape between 4 and 6 ml a day if that helps any

Pretty wide range there, but if we use your 6ml number I'd advise at minimum a pair of 18350s.

 

[ruff]

Thanks wb, it all depends on the type of day im having actually, herr in the last couple of months its been pretty slow at work on those slow days I find I vape alot and not so much when busy on average id say 5.5 ml - 6ml a day

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[jmanning]

How about putting that in terms of liquid used

You are correct there. It's a bit difficult for me to say since I change liquids many times a day but I would consider
myself a heavy vaper at about 4-5 ml a day.

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[ruff]

Now the next question, not really needed but would like to add "in mod" charging for 2x 18650 in series, or could I pull in paralell for higher mah in a vv mod? My current 3.7v 1800mah box ive managed in box charge but it seems to take forever to fully charge the 2x 14500 paralell

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[VpnDrgn]

Yes, it does take a lot longer to charge batts in parallel.
There is no set way to charge batts in series, mainly because of the pcb in each batt.
It is possible but becomes complicated without a lot of options.

An easy way ( but slightly more expensive ) to do it is with a battery pack and a pack charger.
Batteryjunction has li-ion packs with special pcb's and a universal charger that will work with
different voltage packs and single cells.

View attachment VV BOX MOD V2.pdf
Here is a design for a simple VV mod with a charging jack using a pre-made module like the
lm2596. You could use an OKR or Swadj3 with a little different wiring.

The univ charger comes with different connections including bare leads. Wire a male DC jack into the bare
leads and a female DC jack in your mod to plug in for charging. The great thing about this layout is,
you could take out the batt pack and plug in a 12V/5amp transformer ( a laptop charger ) with the same
size DC jack and use the VV mod at home with juice from a wall outlet.
You'd basically have a VV passthru for use at home that you could pop in a batt pack for on the road.

For long battery life you'd be better off with a parallel pack pushing a 4050c booster,
but you'd prolly need a variable ac/dc adapter for lower voltage to use as a VV PT.
Might wanna ask one of the experts about whether you can push a booster with an ac adapter.

 

[ruff]

That sounds great but you pic of the layout didnt show

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n/m didnt realize it was a pdf while viewing with my phone lol