Ugh, I'm still so confused >.> Maybe I'll just buy a sub tank mini and a nautilus and call it a day lol.
off myvaporstore " If you're using a regulated mod, make sure it can handle the amps" how would you calculate that?
Amps are calculated to be the voltage you are using divided by the resistance of the coil. So if you are pushing out 5 volts to the coil and the coil has a resistance of 0.5 ohms, the amps needed are 5 divided by 0.5, which equals 10 amps. So you would need a battery that can handle at least 10 amps continuous. Most of the decent batteries like the LG HE2 and HE4, and the Samsung 25R all handle 20 amps continuous. Batteries like the Sony VTC4's and Orbtronics SX30 handle 30 amps continuous. So these batteries are more than capable of handling the amp requirements of the 0.5 ohm coil. Pushing 5 volts to your tank would be pretty high. This translates to 50 watts (5 volts times 5 volts divided by 0.5 ohms). Some subohm tanks can handle 50 watts although it would be at the extreme high end of the recommended range. Other tanks like the Subtank, 50 watts would be well above the recommended range of the coil (Kanger recommends using the 0.5 ohm OCC between 15 and 30 watts) and would most likely result in a burnt hit because the coil most likely would not be able to wick juice fast enough.
Now if you are talking about mod without removable batteries like the iSticks and the MVP line, those are designed so that they won't exceed the amp load of the battery. You may see the specs (and this also applies to regulated mods that take removable batteries like the Sigeleis) say that it can handle down to 0.5 or even 0.2 ohms, have voltage ranges of 3 to 9 volts and have wattage ranges of 5 to upwards of 150 watts. All three specs are interdependent, so the mod won't allow you to modify one to the point where it exceeds any of the other two.
Let's use the iStick 30 as an example. The iStick 30 can output voltage between 2 and 8 volts, wattage between 5 and 30 watts, and can handle resistance between 0.4 to 5 ohms. You can set the voltage and the iStick will automatically set the wattage based on the resistance, or you can set the wattage and the iStick will automatically set the voltage based on the resistance. So let's go to the extremes and set the voltage to 8 volts and use a coil resistance of 0.4 ohms (the minimum resistance accepted by the iStick). Using the previous formula, this means 8 x 8 / 0.4 = 160 watts, which is well above the 30 watt limit of the iStick, so this means that if you are using a 0.4 ohm coil, the iStick will not allow you to set the voltage up to 8 volts. At the maximum of 30 watts and a resistance of 0.4 ohms, the highest voltage you will be able to use will be the square root of 12 (30 watts times 0.4 ohms), which is 3.464 volts. Now say you want to use that same 0.4 ohm coil, but you want to tootle puff and want to set the wattage to be the minimum of 5 watts. The voltage will be the square root of 2 (5 watts times 0.4 ohms), which is 1.41 volts. The iStick won't let you set the wattage all the way down to 5 watts because it will be below the minimum voltage it can produce (2 volts). It will fire though, at 10 watts, because this translates to be exactly 2 volts, which is the iStick minimum voltage. Of course, vaping at 10 watts with a 0.4 ohm coil might not be very enjoyable. Most likely it would flood and spit because it can't heat up enough to vaporize the juice.
