Sub-Ohm Warning!

Readers who are building very low ohm coils must be aware of the risks in regards to batteries and inhalation.
Please read THIS POST for more information.

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ohms law i need help

Discussion in 'Cloud Chasing & Sub Ohming' started by dragons breath, Jul 26, 2017.

  1. dragons breath

    dragons breath Postman

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    could someone help me with ohms law and tell me what resistance i can use for my battery?
    i have 2 samsung 18650 2500mah 3.7v 20-35amp i will only be using one of these in my mech mod and id like to learn more before i used it!
     
  2. Pyr0

    Pyr0 Postman

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    20 amp constant discharge, 4.2v max voltage
    4.2/20 = 0.21 ohms

    [​IMG]
     
  3. dragons breath

    dragons breath Postman

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    so amps devided by volts ? so if i do a 0.35 ohm build i should be safe yes?
     
  4. Pyr0

    Pyr0 Postman

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    Yeah that only pulls 12 amps from the battery when full, so within safe limits
    4.2v / 0.35 ohms = 12 amps
     
  5. dragons breath

    dragons breath Postman

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    sweet thank you :)
     
  6. Simon G

    Simon G Legend

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    a 0.2 build will draw 21amps at full charge ..... which is getting borderline for safety if you get a stuck button or something.

    Unless you know exactly what you are doing, stay on the upper side of that and you won't ever be over-stressing the cell.
     

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