18650 battery holder for dna20 build - Page 2
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Thread: 18650 battery holder for dna20 build

  1. #11
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    Quote Originally Posted by ecat View Post
    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.
    By JOVE! You hit the nail on the head!
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    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.

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    Quote Originally Posted by ecat View Post
    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.
    Yeah I did notice that, but then I wondered about flat top cells.
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    Mine are flat tops, the 8-9mm still holds true even with them.
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    Quote Originally Posted by mikepetro View Post
    Mine are flat tops, the 8-9mm still holds true even with them.
    Well hot damn.....they just might be perfect if the contacts and circuit aren't resistance hogs
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    I shall soon find out..........
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    Quote Originally Posted by mikepetro View Post
    I shall soon find out..........
    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.
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    the specs are actually a little confusing on that.
    Maximal continuous Charging current 5A
    Maximal continuous Discharging current 5A
    Over charge detection voltage 4.3250.025V
    Over discharge detection voltage 2.50.05V
    Over current detection current 9.51A
    I am wondering if it is just "rated" at 5a continuous, but it looks like the "cutoff" is actually "Over current detection current 9.51A". 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.
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    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

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    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.

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    Quote Originally Posted by Matthew Keller View Post
    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

    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
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