1. SFATA power breakfast with California State Senator Joel Anderson

    Dear Guest, 

    SFATA are being hosted by California State Senator Joel Anderson this Weds for a "power breakfast". You can bring your input and ideas to him at his El Cajon district office between 9.30 and 10.30. If you're interested and can attend, please visit www.tinyurl.com/SFATApowerbreakfast
     to book a place. Thanks!

    Dismiss Notice

18650 battery holder for dna20 build

Discussion in 'Battery Mods' started by Matthew Keller, Nov 17, 2013.

Thread Status:
Not open for further replies.
Image has been removed.
URL has been removed.
Email address has been removed.
Media has been removed.
  1. I am in the process of building a dna20 mod and working out some sizing. One route is 2 tenergy nano tech 1200mah 15c batteries in parallel. Or an 18650 set up. I've been looking around and most seem to be real crappy. If I'm not mistaken the dna20 specs call for 20g wire for the battery to board. If anyone could point me in the right direction that would be awesome! Thanks!

    Sent from my VS870 4G using Tapatalk
     
  2. retird

    retird Vaping Master Verified Member ECF Veteran

    Dec 31, 2010
    North Side
    Pick your enclosure and just replace the wire with 20 guage if it's not already 20 guage....

    Evolv recommends 20 guage and at a minimum of 22 guage.....
     
  3. Thank you for the heads up! I will go that route! I am actually going to buy both battery set ups and test both to see which fits better.

    Sent from my VS870 4G using Tapatalk
     
  4. It's going to be tight either way. I'm just hoping the contacts are going to be conductive enough.

    Sent from my VS870 4G using Tapatalk
     
  5. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    Take a look at these, they even include some protection, this is what I ordered. They havent come in yet so I cant speak to them yet, but I like the concept. Mine should be here tomorrow, I will stop back in and give my opinion of them.

    https://www.fasttech.com/p/1164901
     
  6. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    Well, I got the bat holder in and I like it. The contacts are a thick stiff wire soldered to a PCB. They seem stout enough but i have not run current through them yet. At first glance though I do like these, it just remains to be seen whether can supply DNA type currents without warping the contacts.
     
  7. bapgood

    bapgood Vaping Master Verified Member ECF Veteran

    Supporting member
    Apr 16, 2012
    Utah
    Did you buy two? I should have bought two, and my order with this is on it is still at FT (packaging...woot...woot) waiting for the Kraken clones I ordered.

    The reason I ask, is because it would be great to know if there is was any reverse polarity protection, for either one or both cell. I find it hard to believe someone would go through the trouble to put in protection and not take in account for the very probable situation of putting one or both batteries in wrong.

    Edit - Never mind, the big warning label indicates other wise :D
     
  8. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    Yeah, I bought two, and no I dont want to test their warning label.........
     
  9. ecat

    ecat Full Member

    Oct 7, 2013
    uk
    If the designers are on the ball you'll find the -ve case contact will be unable to touch the +ve end of an upside down battery. Looking at the image it is hard to determine if this is actually the case but it does look likely.
     
  10. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    By JOVE! You hit the nail on the head!
    Buy that man a beer! :toast:

    The gap between the protruding nipples on the negative terminal of bat holder has a gap of 11.11mm. I measured 4 different brands of batteries and the width of the positive terminal ranged from 8mm to 9mm. Indeed, any of the bats I have would not make contact if inserted upside down.

    [​IMG]
     
  11. bapgood

    bapgood Vaping Master Verified Member ECF Veteran

    Supporting member
    Apr 16, 2012
    Utah
    Yeah I did notice that, but then I wondered about flat top cells.
     
  12. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    Mine are flat tops, the 8-9mm still holds true even with them.
     
  13. bapgood

    bapgood Vaping Master Verified Member ECF Veteran

    Supporting member
    Apr 16, 2012
    Utah
    Well hot damn.....they just might be perfect if the contacts and circuit aren't resistance hogs
     
  14. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    I shall soon find out..........
     
  15. bapgood

    bapgood Vaping Master Verified Member ECF Veteran

    Supporting member
    Apr 16, 2012
    Utah
    Well you should be able to pull 20 watts until the battery is below 4v with the 5a protection circuit. It will be right on the edge, but you should be able to do about 16.5 watts down to the voltage cutoff.
     
  16. mikepetro

    mikepetro Vape Geek Verified Member ECF Veteran

    Supporting member
    the specs are actually a little confusing on that.
    I am wondering if it is just "rated" at 5a continuous, but it looks like the "cutoff" is actually "Over current detection current 9.5±1A". That cutoff "implies" that it doesnt actually clamp it at 5a.

    Not extremely clear.........

    At any rate, it is a good starter piece for my first Mod, something break my teeth in on. If I melt it down I will just chalk it up as a learning opportunity.
     
  17. Crap totally lost track of this thread. Great info though! I'm currently building one prototype with an 18650, one with some turnigy nano tech rind cells.

    Sent from my VS870 4G using Tapatalk
     
  18. Also I'm deciding if I'm going to throw a pair of ptc 3a resettable fuses in parallel or run without. Even at .7ohms and 20 watts it's only doing 5.35 amps.

    Sent from my VS870 4G using Tapatalk
     
  19. bapgood

    bapgood Vaping Master Verified Member ECF Veteran

    Supporting member
    Apr 16, 2012
    Utah

    That's not how you calc the amp draw from the battery. A full battery is 4.2v, voltage cutoff is 3.3v iirc, and let's use 20w.

    20/4.2=4.76 amps
    20/3.3=6.06 amps
     
Thread Status:
Not open for further replies.

Share This Page