Question: on wiring batteries

Ok, I am trying my hand at doing a variable volt mod, I am not stacking the batteries but putting them into a box, how do I take the 2 positive battery contacts and put them to the switch? Do I just run each one independent to the switch and solder them together at the switch? FYI I am trying to use the OKR-T diagram which has them in a series? I am lost, help

 

I looked up the OKR-T regulator and got this link for the datasheet.
http://www.murata-ps.com/data/power/okr-t3-w12.pdf

I am not sure but it looks like it is designed to output at a LOWER voltage than the input (like a standard VV Reg) .. therefore, if this is true, you must put your two batts in series (stacked). If you wire them parallel you will have only about 3.7V with a lot of current, where input volt range of the module is 4.5v - 14v. Two batts stacked will give you 7.4+.

The OKR-T module has a control pin, meaning you can use a small switch to control the unit. Look at page 3 of the datasheet, it has full pin-outs.

Here's the layout, so far as I understand it:
Pin 1: control pin, Goes to ground to turn off, so you will put a resistor from 1 to 3 (gnd) and a switch from 1 to 2 (V+)
Pin 2: input V+ .. from batt+ (thru master switch) to this pin
Pin 3: ground .. from batt - and also to shield on your atty connector (and neg side of any LEDs you put in there)
Pin 4: output V+ .. to center cond of atty connector (also thru resistor to LED pos pin)
Pin 5: output trim (adjustment) .. see page 5 for output voltage chart. Basicall, you are gonna put a 220 ohm and a trim pot in series, a 500 ohm trim pot will give you approx 2.2v - 6v adjustable output, a 1K pot will give you a range of about 1.6v - 6v. You are gonna need the 220 ohm resistor, you can experiment with the pot.

Oh My Lord, I am rambling on again, sorry.

Bottom line: you're gonna need to stack them for use with that particular VV regulator.

OK, I'll shut up now

 

I will read through what you just said a few more times. So let me see if I got you right I need to stack them because of the output they generate together and this set up is made to run with this higher output. Right? So I was planning on using 2 18650 in the mod, so because I need to stack them I am going to have to switch to two smaller batteries right? Would 2 18350 work?

 

That's what I was saying .. you will need to configure the batts in series, though they don't need to physically be stacked, it's the wiring I am writing about. If you take a look at a standard 2-AA or 3-AA box, you will notice that the neg lead comes from one batt, while the pos lead (red) comes from another. The batteries are, basically, daisy-chained together.

Here's a 3-AA box. The blue lines show the flow of electricity.


As you see, the neg of the first batt goes to the pos of the second, the neg of the second goes to the pos of the third. The result is that you have a 3-cell battery pack. You will be doing the same thing with 2-18650 batts: pos on one to neg on the other, result is twice the voltage (3.7v x 2 = 7.4v) which your regulator requires.

Make sense? I don't know if I am explaining this correctly.

 

LOL I really thought I had to physically stack them. I totally understand with your drawing. You hit the nail on the head with it. Thanks so much for the help, I think once i get the first one done it will be alot easier. Your a life saver and big thanks to you. ( god I feel like a dope right now)

 

Yeah we often confuse noobs by saying "stacked" but they also get confused between parallel and series.

We should have a modders class in chat once a month or so to keep it straight.

Here is a quick cheat sheet:

Series or stacked means that the positive of battery one is connected to the negative of battery 2 and the positive of that battery is connected in this case to the atomizer center post while the negative of battery one is connected to the outside collar of the atomizer connection. You may but the switch inline on either positive or negative wires.

Parallel or side by side or double barrel means that two batteries positive is wired to the center post of the atomizer connection. Also both negatives are connected to the outside collar of the atomizer connection. You may put your switch in either the positive or negitive "paths" or wires. Just remember to put the switch in both positive or negative wires.

 

Thanks Papa Hoyt, I wish there was a class named "mods for the electronically challenged" LOL