Please help me find directions to make a VV mod

[Robert MW]

I am good with a soldering iron, power tools, and my hands in general. What I am not is an electrical engineer. I am looking for directions to build a VV mod for my wife. I am looking to build one with a switching regulator and a voltage display. What I need is a parts list and a simple this wire goes to that post type of direction. I do not need a bottom feed and the box is not important. If I have the directions I can find or make my own box. If any of you could lead me to a post or website with specific directions I would greatly appreciate it.


I have seen some beautiful box modes on this site from suppliers that create true works of art. I have to admit that I would love to purchase one of them for my wife, but I simply can not afford to spend that kind of money presently. I have no wish or time to make or sell such mods for profit. So if you are one of those suppliers you could PM me a parts list and or directions and they would never go any further than me. My wife has not smoked for more than 2 months and I am very proud of her. I think she deserves a better PV than her Ego and I would love to make her one.

 

[sierra22]

The serch function will be your friend. There are many many MANY threads on building VV mods.

 

[THJahar]

here you go, It's steel Jans video on building a VV (she uses a plastic elmo case! But you can put it in a any box you want)
It shows all the parts and how to solder the VV & display and the atty/batteries together:

 

[bstedh]

Search for my easy okr-t vv post

Sent from my HERO200 using Tapatalk

 

[TomCatt]

MadVapes.com has a VV board kit, regulator, resistors, pot and PCB for like $8.

 

[mv2envy]

Easy OKR-T is the best. I followed those directions and did a dual 18650 mod and it kicks ...!

 

[bstedh]

Easy OKR-T is the best. I followed those directions and did a dual 18650 mod and it kicks ...!

I'm still looking for a good container to do the 18650 mod in... I have like 24 of those batteries from donor laptops and nothing to put them all in. I'm thinking of a tube mod big enough to put 3 of them in a configuration like the 9 LED flashlight battery pack. =} Now I have to go back and check the OKR's max input voltage...

 

[raceengine]

I'm still looking for a good container to do the 18650 mod in... I have like 24 of those batteries from donor laptops and nothing to put them all in. I'm thinking of a tube mod big enough to put 3 of them in a configuration like the 9 LED flashlight battery pack. =} Now I have to go back and check the OKR's max input voltage...

It should work if it's the same as the evercool. I tried 3x 18350 with the ptr08100wvd evercool and it works.

 

[mv2envy]

Why 3? The extra voltage will do nothing for you, nor will it add any extra run time since it will be connected in series. I use Radio Shack 1"x2"x4" project boxes for my dual 18650 mods. A bit of a tight fit, but works very well!

I even added a charging port to the mod right under the pot so I can charge the batts without removing them from the mod. I use the Customize 7.4V Li-Ion car charger (with home charger adapter) to charge up the batts. Its the perfect solution!

 

[mv2envy]

You can also use one of these, I know it says its for parallel but batteries still make very good contact when installed in series. You still have enough room for the regulator and a voltage display on it.

http://www.ebay.com/itm/18650-batte...143?pt=LH_DefaultDomain_0&hash=item1c1e65e37f

 

[raceengine]

You can also use one of these, I know it says its for parallel but batteries still make very good contact when installed in series. You still have enough room for the regulator and a voltage display on it.

18650 battery case 2 x parallel connection DIY case | eBay

That's what I used as well.
http://www.e-cigarette-forum.com/fo...cool-variable-voltage-mod-85.html#post3565382

And V2 of it.
http://www.e-cigarette-forum.com/fo...cool-variable-voltage-mod-91.html#post3825228

 

[VpnDrgn]

I even added a charging port to the mod right under the pot so I can charge the batts without removing them from the mod. I use the Customize 7.4V Li-Ion car charger (with home charger adapter) to charge up the batts. Its the perfect solution!

Do you have a link for this 7.4v charger?

 

[mv2envy]

The home version is out of stock right now, but this is it Customize Smart Charger (1.2A) for 7.4V Li-ion/Polymer Rechargeable Battery Pack with 5.5x2.5mm Barrel connector -- UL/CE listed

I use the car version with a cig lighter adapter from radio shack at home and I can take it on road trips with me for car charging. You can buy the proper size barrel connector from radio shack also. It charges protected and unprotected batteries and will not overcharge them

This is the one I have

Customize Smart DC Charger for 7.4V Li-ion Battery Pack with 5.5x2.5mm male barrel connector

You can order this with the car version for home charging AC-DC Adaptor: 100-240V AC to 12V DC, 1.5A with car plug adapter ( UL-Listed)

Here are the DC female plugs you can put in your mod http://www.ebay.com/itm/New-10-Pcs-...ltDomain_0&hash=item45fc707680#ht_3814wt_1165

 

[VpnDrgn]

Ok, I thought you were talking about a circuit module that you built into your mod.

Here is the one I figured on using when I finally get around to my VV mod.

 

[Java_Az]

Why 3? The extra voltage will do nothing for you, nor will it add any extra run time since it will be connected in series. I use Radio Shack 1"x2"x4" project boxes for my dual 18650 mods. A bit of a tight fit, but works very well!

It will actually add run time about 1/3 With the evercool chip. Since you are bucking down with a very effiecent switching regulator. 1600mah at 4.2 volts is not the same as 1600 mah at 12.6 volts. There is a lot more watts is the 1600 12.6 volts. If you put a amp meter on the 12 volt input and one on the lets say 4.7 volt output with a 2.3 ohm atomizer. The output would be reading around 2 amps, But the 12.6 input would be reading around 800mA or .8 amps. With two stacked batteries @ 8.4 volts your input would be around 1.3 amps. Anyways 3 stacked batteries would for sure last longer then 2.

 

[mv2envy]

Ok, I thought you were talking about a circuit module that you built into your mod.

Here is the one I figured on using when I finally get around to my VV mod.

No such circuit for dual batts, sorry. And that charger you linked will probably not work for dual batts. It says the voltage selection is 3.7 and 7.2. You need a 7.4V charger, not 7.2! 2X 3.7 = 7.4 And only 500ma? Do you know how long it will take to charge 2 18650's at 500ma?

The customize car charger is the best solution really. Charge at home or in the car! And it pushes 1000ma charge rate, twice as fast as the charger you linked to.

 

[VpnDrgn]

It is a universal charger.

* For 3.6/3.7V 1-cell pack, set switch button 4.2 position on the charger
* For 7.2/7.4V 2-cell pack, set switch button 8.4 position on the charger
* For 10.8/11.1V 3-cell pack, set switch button 12.6 position on the charger
* For 14.4/14.8V 4-cell pack, set switch button 16.8 position on the charger

500ma is kinda low, but as long as I don't kill the pack it should only take about 6 hours to charge.
An easy overnight charge. I was also considering the fact that I read somewhere that higher charge
rates where ok for the polymer packs but the li-ion packs got longer life out of slower rates.
I figured that was why most of the li-ion chargers are usually between 320 and 500ma.

edit - I was looking at your links again and I notice they both say battery "packs".
I asked Battery Junction about the packs and the univ charger and they explained the packs have pcb's
with charging controllers for the multi cells and extra polyswitch fuses. Don't know how dangerous
it might be for batts that are just wired in series with single cell pcb's. Have you been monitoring voltage
levels on the individual batts before and after charging? If the voltage between cells gets too far out of
whack, it'll cause a melt down won't it?

 

[mv2envy]

500ma is only 250mah per battery, that is a very slow charger! The customize is a smart charger and has a voltage cut-off at 8.4V (4.2V per battery) No overcharging possible with or without protected cells.

 

[VpnDrgn]

Charging rate of my recommendation aside, I was trying to point out that your charger may have overcharge protection,
but it has no way to monitor each cell. Many people have asked about on board charging for dual cell mods, and many
modders agree that the biggest issue is charge monitoring between the cells. If you run 2 cells in series with pcb's
on each cell, when one cell reaches 4.2v first it cuts off charging which interrupts the circuit for the other cell.

It becomes cumulative when one cell keeps cutting off the other from getting a full charge. The most common
recommendation for a work around is to wire in a switch for a parallel circuit during charging and a series circuit
for vaping. I would suggest at least checking your cells to make sure they are still balanced.

But that's just my opinion, good luck.

 

[CraigHB]

I wouldn't call that an opinion, pretty much of a fact.

VpnDrgn summed up the problem nicely, but more specifically, if you're going to charge a pack by applying voltage across both cells in series, you have to rely on each cell's over-charge protection to eliminate the possibility of a dangerous over-charge condition. PCB protection circuits don't cut out the cell exactly at 4.2V, they have to go a little higher. Otherwise it would not be possible to normally charge a cell. Charging only a few hundredths of a volt over 4.2V puts premature wear on a 3.7V Li-Ion cell. So, when using a pack charger in lieu of a balancing charger, you run the risk of excessive wear on one cell and incomplete charging on the other cell. Once a cells gets more wear, it cumulatively wears more than the other cell every charge cycle until it dies prematurely.

There's a couple ways you can balance charge a series pack in a mod. One is the way it's done with the hobby 2S LiPo packs where a dedicated 3-pin connector is used with a balancing charger. The other way to do it, as VpnDrgn already mentioned, would be with two single cell chargers. For example, use two USB charger modules and a switch to pull the batts out of series for charging.

Here's an inexpensive balancing charger. Everyone knows where to get the USB single cell charger modules, they've been linked to many times in this forum.