Help with double battery 3.7 mod

[Christopherdav1d]

Hello everyone, I am new to modding and interested in making a double 18650 3.7 mod. Does anyone know of a link on here that can help with supplies needed and help wi building. Like I said, I am fairly new to modding so don't know a lot. In my head putting two 18650's in a mod is going to make like....7.4V? No? How do you regulate it to be able to use two 18650's and keep the mod at 3.7V. Sort of like a tekk, just 3.7.....and doesn't have to do what a tekk does. So really, nothing like a tekk so scrap that lol. If anyone knows a good link that will help me achieve that it would appreciate it greatly.

 

[kcofohio]

You would want to run your batts parallel with each other. Connect ++ and --, and run your leads off those. That will keep you at 3.7v and will double you Mah. With 2 18650s, you'll want a project box slightly larger than 3"x2"x1". Madvapes.com could have alot of what you need.

Project Box 3.8" x 2.4" x 1.0"

Here is one box to consider, though I have never bought it.

 

[lynch]

I got this on ebay for about $9.00, sorry dont have the link

 

[Christopherdav1d]

Thanks, exactly the answer I was looking for!!!

 

[kcofohio]

If the 18650s fit, that will be even better. It is already for parallel batts.

 

[kcofohio]

Here is a tutorial for wiring, may not be the same, but it might get you in the right direction.

Welcome!

 

[lynch]

If the 18650s fit, that will be even better. It is already for parallel batts.

The box is made for 18650's, but I also use it for 4- 16340's 3.7 volt bats and have a parallel 7.4 .

 

[kcofohio]

To run at 3.7v, I'm only familiar with vv regs, Madvape has a kit that can handle the amps.
Variable Voltage Regulator Board Kit Rev 2
If you are wanting to run straight 7.4v, you would want at least a 5 ohms atty, and that would run about 10 or so watts. 7-8 watts is what most prefer.

 

[Christopherdav1d]

Here is a tutorial for wiring, may not be the same, but it might get you in the right direction.

Welcome!

I def don't want 7.4V. Looking to make a double battery mod at strictly 3.7V

 

[TomCatt]

Here's an eBay link on the 2 18650 parallel box - 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay

 

[lynch]

Here's an eBay link on the 2 18650 parallel box - 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay

$6.99 is a good price, I paid $8.99

 

[Propperimprint]

Here's an eBay link on the 2 18650 parallel box - 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay

at that size could you fit a small bottom feed battle in there like a 3 mil bottle or is it big enough for something larger?

 

[ruff]

Yes that is the same box I have coming for my 18650s, but I'm making mine vv

As for your wanting a 3.7v box just run the batts in paralell as mentioned earlier run the - side to the outer part of the 510 connector and the + side to one leg of your master on/off switch, then run another wire from the opposite side of the on/off to a push button (fire) switch, then run a wire from opposite side of push button to the center post of the 510 connector

Sent from my SAMSUNG-SGH-I897 using Tapatalk

 

[slimest]

I am not shure, that topicstarter wants 2 batteries in parallel. If so, I'm asking: what for? To achieve bigger amperage - no, one accumulator is enough. Bigger capacitance - there are a lot bigger batteries in one body, why to connect them in parallel? To achieve adequate and non-expensive varivolt or just hi-volt - you need to connect batteries in series, not in parallel. And this is absolutely different system. Never seen mods with 2 18650 in parallel - don't see an advantage...

 

[ruff]

2 batts in paralell = higher mah = longer times between charging, I had a similar setup with 2 14500s and the batteries would last me twice as long as a 1 x 14500 batt, plus you can charge them in the mod if they are paralell without the need of extra circuits to monitor each battery to make sure it is a regulated charge.

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[slimest]

Of course everyone can choose his own system. Anyway TS asked about fixed voltage, so he supposed to use a stabilizer. For 2 batteries it is much easier and cheaper to connect them in series and use a buck converter.
I see only one advantage to use 2 batteriess in parallel - charge them with a standard charger withiout removing from the body. But easier to use only one biggest accumulator, say 26xxx

TS, may I recommend to you this topic: http://www.e-cigarette-forum.com/forum/battery-mods/247184-list-mod-coverters-newbs.html
You can just purchase 2 18650 (or less dimensions) batteries and choose a DC-DC step-down converter from this topic. Some of them are very cheap and powerful. You even can make a varivolt, not only stabilizer.

Another, simplest way is to use just one or two AW IMR batteries (if two, in parallel) and use them without any electronics, only button. These batteries have very constant voltage on discharge, about 3.6 volts. But voltage control during discharge is critical - you have to charge them when voltage is 3.5 volts or less. Some users feel this voltage, when the vapour comes too poor.