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Kangertech topbox mini 75w battery recommendation??

Discussion in 'The Thailand Vaping Newbies' started by Bart., Mar 20, 2016.

  1. hotdogs1

    hotdogs1 Well-Known Member

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    I'm using it with my Atlantis at 25w. The iStick is in series so being safe, using 6v as the lowest input you have.
    25w / 6v = 4.16A this makes me think they are fine for this application.
    I do have some VTC 5 and VTC 4 as well. I haven't used the Panasonics for a few weeks because I was worried about them.
    **Updated**
    Just goggled to check and they are in parallel. Going to read that article again before I bring the Panasonics out of hibernation.
     
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  2. Lyss
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    Lyss Well-Known Member

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    It's very easy to determine. Sure, as SD wrote, it depends on your coil resistance.
    Wattage=(Current^2)*Resistance.
    Now just imagine that you're using 0,2ohm coil, and you don't want to exceed 10A (if 6,8A current stated for continuous discharge, then 10A 2-3s puffs with 5-20s pauses between them are quite acceptable):
    Wattage=(10^2)*0.2=100*0.2=20W. That's the power you don't want to exceed.
    If you wanna be more conservative and limit yourself with ie. 7A while using 0.5ohm coil:
    Wattage=(7^2)*0,5=49*0,5=~25W.
    And so on.
     
  3. Siam Diesel
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    Siam Diesel Nauti Moderator Staff Member

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    I crossed that out. ;)

    Resistance doesn't get factored in for regulated mods...the reddit article linked below explains it much better than I could. :)
     
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  4. hotdogs1

    hotdogs1 Well-Known Member

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    Parallel I should be fine too. One guy did recommend using 2.5 as the minimum voltage to be safe. That would have me drawing 5a per battery.

    The local suppliers on this forum don't have much in stock as far as batteries are concerned at the moment.
     
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  5. Siam Diesel
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    Siam Diesel Nauti Moderator Staff Member

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    Big just posted a new stock of VTC5's...

    We never get down that far in our mods...lowest I've seen is about 3.2 volts so you'd be more than safe with 3 volts, I'd think.
     
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  6. Lyss
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    Lyss Well-Known Member

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    Reasonable, I simply forgot that moment and calculated the power at the output. The battery stays at the input as the power supply, and we only have to calculate it's max power at its lowest voltage.
    So, if we take that a mod cuts out the battery at let's say 2.9V, and we limit ourselves by 10A, then we have max power 29W (not continuous discharge ofc). Minus various losses here and there 5 to 10%, the result would be 25W.
     
  7. Longtail1
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    Longtail1 Vaping Troll

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    Between the VTC ad the Panasonic, as you have both I persoanlly wouldn't consider using the Panasonic. Hopefully the VTC 4's/5's are in married pairs though.

    I fully accept that they are safe within certain constraints, but everyone makes an occasional error and in this situation that could be a rather large error.
     
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  8. hotdogs1

    hotdogs1 Well-Known Member

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    I have some other tanks and mods. My KBox only does down to 0.4 ohms. It's been a real juggling act since I stopped using the Panasonics. The iStick with the Atlantis is what I Vape 90% of the time. I got a IPV box off Big a week ago. I ordered 4 VTC5's off Big about 10 minutes ago.
     
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