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Noob question about wiring a charging circuit...

Discussion in 'Battery Mods' started by Artifex75, Oct 9, 2013.

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  1. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    I am a noob, but I Aspire to be better. :)

    So, I come to you with a question. How do I wire this:

    $T2eC16h,!)QE9s3HG-mcBR3s3uz2Gw~~60_3.jpg

    Into this:

    ti-1002w.jpg
    When I'm running two 3.7v lithium ion batteries? Is it even possible to passthru that circuit for usb charging? There's an enclosure that I'm itching to use, but it's not conducive to daily battery removal. If not that charging circuit, is there a better one to use?

    Teach me, oh learned ones!
     
  2. retird

    retird Vaping Master Verified Member ECF Veteran

    Dec 31, 2010
    North Side
    Are the batteries in parallel or series?
     
  3. rolf

    rolf Super Member Verified Member ECF Veteran

    Jan 24, 2012
    spokane wa
    artifex75
    that is the same board I used in a couple of mods ..works nice for me ...your batterys must be in parallel 3.7 volts .you canot charge 7 + volts with it.also I would put a pt fuse in either the pos or neg leg .
     
  4. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    Okay, so I can wire them in parallel easy enough, but can the TI chip convert that to a 5v output or do I need to have them in series in order to get anything over 3.7v? Is there a 7.2v charging board or would that be impossible with a 5v usb input?
     
  5. retird

    retird Vaping Master Verified Member ECF Veteran

    Dec 31, 2010
    North Side
    Which TI chip do you have? Is it a "buck" or a "boost" regulator?
     
  6. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    It's the PTR08100W... I'm assuming that the buck reduces voltage while the boost increases? I think it's a buck in that case.
     
  7. retird

    retird Vaping Master Verified Member ECF Veteran

    Dec 31, 2010
    North Side
    Yep it is a "buck" so the batteries will need to be in series to work and NO the usb charger board cannot be used in this configuration....you can't charge 3.7 volt batteries in series........
     
  8. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    Okay, so would this be a better choice for something like this...

    DIY Power Bank 3 7V 5V Voltage Step Up Boost Board Kit w LCD Screen Display | eBay

    It seems as if I can wire multiple batteries in parallel and still get 5v output with USB charging. Is there a better boost regulator out there?

    Edit: Never mind, there's a limit of 4.2v input on that unit.

    I pretty much just want a 5v setup with multiple batteries and an internal charger. What if I put in a port to connect a higher voltage ac charger, like one for hobby batteries or something of that nature?
     
  9. dr g

    dr g Moved On ECF Veteran

    Mar 12, 2012
    Paradise
    By the time you jump through all those hoops you might as well have started with a better board.
     
  10. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    What board would allow for the onboard charging of multiple batteries? Does the DNA20D allow for it?

    By the time I spend $50 on the DNA20D board and everything else, I may as well get an Innokin iTaste MVP2. Is there a less expensive option?
     
  11. cadcoke5

    cadcoke5 Senior Member ECF Veteran

    Jan 23, 2010
    Lancaster, PA
    You might consider wiring a switch that changes between ON and OFF with the ON wired so that the batteries are connected in series. Then, the OFF is wired so that it connects the batteries, each separately to its own charging circuit.

    It may require a Four-Pole, Double-Throw... a 4PDT. Here is a link to one, but it certainly is not a small switch at It is 3/4" wide by 1 3/8" long.
    It is digikey part SC1821-ND. For some reason my pasted URL was not considered valid.

    Here is a quick sketch of how the poles might be connected.
    Parallel Charge-Series On switch with 4PDT.jpg

    -Joe Dunfee
     

    Attached Files:

  12. retird

    retird Vaping Master Verified Member ECF Veteran

    Dec 31, 2010
    North Side
    The rating of the contacts of this switch is only .5amps DC.............not near enough for the output current needed for vaping.....
     
  13. breaktru

    breaktru Vaping Master Verified Member ECF Veteran

    I use a 3PDT switch in my MCU mod running 2 Li-Pos in series and charging them in parallel: 3PDT Schematic
     
  14. dr g

    dr g Moved On ECF Veteran

    Mar 12, 2012
    Paradise
    You will need to charge the cells individually (or in parallel) somehow.

    Not the same class of device.
     
  15. Artifex75

    Artifex75 Senior Member Verified Member ECF Veteran

    Jul 2, 2013
    Chillicothe Oh
    Yeah! Now that's what Willis was talkin' 'bout. :)

    I knew it was possible, my brain just wasn't going in the right direction. I'm off to fasttech to hunt down some switches, unless there's a better site? Is this something more easily found on eBay?
     
  16. cadcoke5

    cadcoke5 Senior Member ECF Veteran

    Jan 23, 2010
    Lancaster, PA
    I can see a potential problem with using a single charger and charging batteries in parallel. If one of the batteries have an internal short, then the other battery is going to be able to push current through it without any restraint, other than what resistance the bad battery still has.

    I did actually find some high current switches with 4 poles, but they are so large that they aren't usable.

    Originally I though that an electronic switch would solve the problem of the .5 amp limit. But, now I realize it would not, because the 4 pole switch has to provide the power to the electronic switch itself.

    Thanks for catching that error.

    -Joe Dunfee
     
  17. cadcoke5

    cadcoke5 Senior Member ECF Veteran

    Jan 23, 2010
    Lancaster, PA
    I think I found the solution. But, I can't seem to find it in 4-pole, nor a small enough size.

    Giant knife switch.jpg

    -Joe Dunfee
     
  18. kaddigart

    kaddigart Senior Member ECF Veteran

    Mar 8, 2013
    Insomniville
    Awesome, combination APV and execution device. Or maybe you live near a train yard?
    sammy_ndem_04.jpg

    Seriously though, it seems like I read somewhere about somebody using an On/Off/On type switch...not sure about the technical designation for that, I'm still learning myself. 3P3T?
     
  19. breaktru

    breaktru Vaping Master Verified Member ECF Veteran

    No, 3PDT as shown in my link in reply #13
     
  20. kaddigart

    kaddigart Senior Member ECF Veteran

    Mar 8, 2013
    Insomniville
    Guess that explains where I read it before...

    I just re-read it on your forum - that box is crazy complicated (for me anyway). Forgive me if this is a dumb question, but that switch along with the charging circuit would be wired into the rest of it where? What I mean is, say I wired the basic 5v mod guts (instead of the OKR-T6) on one board and the charging circuit on another. Could the latter just be wired in somewhere interrupting the other circuit between the batteries and VIN on a regulator?
     
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