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DNA75 can't show USB charge current? And a few other ?s

Discussion in 'Batteries and Chargers' started by vapesmooth123, Feb 3, 2018.

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  1. vapesmooth123

    vapesmooth123 Senior Member ECF Veteran

    Jun 23, 2016
    just got a DNA75 Hcigar VT75 nano. Tried to set up in escribe to show the USB charge current on screen. But unlike my old DNA200, I see no option on the dropdown menu to show "USB CURRENT", only "Current" which apparently isn't USB current, whatever "current" is, it stays at 0.00A while charging. I just like to see what Amps the usb is charging at. Max is 1.0A on a DNA75, correct?

    But DNA250 max USB charges at 2A, correct? But then how come my new Hcigar vt250s DNA250 is only showing max .95A when using a 2.1A wall adapter? The USB cord I'm using can't supply 2A or something?





    One last thing for now, Under MOD tab I have my old DNA200 triple 18650 mod set to the following which I think someone told me in the past to do:
    Battery
    capacity: 33 Wh 3 cell
    Soft Cell cutoff: 2.8V

    Charging Mode: max recharges (instead of max puffs).

    Should I set my new DNA250 and DNA75 mods also to Capacity 33 Wh, and set soft cell cutoff to 2.8V? I know what max charges and max puffs means, but not sure about 33Wh is. At default the DNA250 is 9wh. the DNA75 doesn't even show anything there for Wh. And soft cell cutoff at default is 3.09 V on the DNA250.



    I'm using dual sony vt6 3000 mAh in the DNA250 by the way, and a single 18650 3000 mAh LG H2 in the DNA75. And I plan to only ever charge these via the MOD's USB.



    It's just safer to make soft cell cutoff lower than the default 3.09V, but it's kind of like max recharges vs max puffs in that you don't stress the batteries as much and therefore get more months out of them vs more puffs between charges? Don't these cells charge to 4.2V on an external anyway? Why is default 3.09V so much lower than that though?
     
  2. DaveP

    DaveP PV Master & Musician ECF Veteran

    Supporting member
    May 22, 2010
    Central GA
    The current value that's in the menu is probably an option to see atomizer coil current draw in the display when you hit the fire button.

    Order this and use it inline with your mod to see the actual current draw your device is drawing during charge from a USB wall wart power supply. You'll probably find that it's drawing a little under 1A if it's a USB 2.x device. It's a good tool for under $10 and it's the one I use.

    USB 2.x vs USB 3.x may determine the charging current. USB 3.x spec allows higher charging currents than 2.x.

    https://www.amazon.com/DROK-Digital-Voltage-Current-Charging/dp/B00LL5UJY0/ref=sr_1_5?ie=UTF8&qid=1517664120&sr=8-5&keywords=drok+usb+power+meter
     
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  3. vapesmooth123

    vapesmooth123 Senior Member ECF Veteran

    Jun 23, 2016
    I don't really want to get an adapter. I charge in car too and not want carry extra stuff. Just wondering is DNA75 is even possible to show USB current being applied during charge. Maybe not because maybe DNA75 came out before DNA200 (which does show USB current of charge). I guess not a big deal because I CAN see battery charge % on screen and at least know it's charging.

    "But DNA250 max USB charges at 2A, correct? But then how come my new Hcigar vt250s DNA250 is only showing max .95A when using a 2.1A wall adapter? The USB cord I'm using can't supply 2A or something?"


    Once the DNA250 mod got down to about %30 battery life, it DID charge at somewhere around 1.35A with the 2.1A wall adapter. My DNA200 (when charging worked) did something similar, it would reduce USB current A as it started to get towards %100 battery life, I guess it's safer this way. Maybe though I was only getting 1.35A and not 2A to the DNA250 because it was a USB 2.0 instead of 3.0 but I doubt that. As long it's over 1A I'm confident in it not being something I needed to set in escribe or something.

    Still wondering about all the rest ?s though is anyone knows. thanks
     
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  4. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    The wh of your batteries is calculated by multiplying the nominal voltage with the capacity. Single-coil battery 3000 mAh = 3.7 * 3000 = 11100 mWh = 11.1 wh. Dual battery 3000 mAh = 7.4 * 3000 = 22200 mWh = 22.2 wh. Escribe has a built in calculator for Wh.

    As for your charging current, it may be that either your wall adapter isn't actually 2.1a, or that your USB cable can't handle 2 amps.

    A low voltage cutoff at 3.09 is higher than 2.8, and therefore safer (although 2.8v is perfectly fine). You've got your numbers the wrong way there.

    Also, the DNA 75 was released after the DNA 200.

    Sent from my Thor E using Tapatalk
     
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  5. vapesmooth123

    vapesmooth123 Senior Member ECF Veteran

    Jun 23, 2016
    ok so I just updated the Wh to my dual 3000 mAh 18650 DNA250. I changed it to 22 wH. What does this even do? longer battery life? Is it dangerous if I set it wrong?

    As for the DNA250 not getting 2.0A USB charge current, and for the DNA75 not being able to show any USB charge current at all (I take it it can not even do so?)
    someone on evolve forum said this:
    The 250 limits current to 1 A if there is a data connection on the USB, lowering current in the last phase of charging is when the charging changes from constant current to constant voltage mode and all lithium battery charges do this for safety and efficient charging. Charge current will also lower if the board temp is high, again for safety.

    Only 200s & 250s have a balance charging controller that the board can read the current from, the 75 & 75C have a simpler charger chip which does not provide that info, but the board can stop or start charging, the 60 can't do that as the charger is a separate board.
     
  6. KenD

    KenD Vaping Master ECF Veteran

    Aug 20, 2013
    Stockholm, Sweden
    The wh setting only makes the battery bar more accurate, it won't affect battery life in any way.

    Sent from my Thor E using Tapatalk
     
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