New box mod help?

[cinderhella]

Hey! So I've been using a sigelei box mod for a while with the sub ohm atlantis aspire tank. My friend just bought me the vampire coffin mod. Its a mechanical mod. Ive never used one before. It uses a 26650 3500mAh battery. I'm wondering is it safe to use my atlantis? Do I need to get an RDA? What ohms in general are safe to use with this type of battery/mod. Thank you everyone!

 

[State O' Flux]

No responses for two days? Strange.

Anyway... For calculations you actually need, you can ignore the mAh rating. What you want is the fully charged voltage (4.2v); and manufacturer's MCCD (maximum continuous current discharge), amp rating.

For example, a MNKE 26650 has a MCCD of 20A and what my quick Google reference calls a "Maximum Instantaneous Discharging Current 60 A"... other's use the terms momentary or pulse to describe the time specific, higher current... if at all.
Some less-than-reputable dealers will list ONLY the pulse current (usually calling it "maximum current") in an attempt to sucker in battery n00bs.

The problem with the timed discharge value is... very few manufacturers tell you what the time frame is for that pulse discharge. Is it 20 seconds, 10, 5... one second? If you've not done deep research, and/or are not well acquainted with your batteries, use the MCCD value.

So... now for the Ohm's law values you need to figure out resistance to amperage "parity":

• For amperage (A, C, I or "Current")... the formula is: V ÷ Ω = C
• For resistance (Ω, Ohms or R)... the formula is: V ÷ C = Ω

You want to know if your Atlantis tank will work with a 26650 mech mod. You have 20 amps and 4.2 volts to play with, so lets look at an example, for 0.50Ω:

4.2v ÷ 0.5Ω = 8.4 amps.

What this means is you can easily support your 0.5Ω net resistance, and have 11.6 amps of "headroom" remaining. Quite a margin of safety there, eh?
To see how low you can go, simply select your MCCD with what ever headroom you're comfortable with, and use the second formula. Want to run a 5% headroom? That's 19 amps.

4.2v ÷ 19a = 0.22Ω

If you want to learn quite a bit more than the basic Ohm's law info above... click on all three sigline hyperlinks below, and start reading.

 

[Cloudboss]

If it was already mentioned above I missed it but there is an ohms law calculator app for android. Probably one for apple also. I doubt your sub ohm tank is to low for a 26650 battery. Bit even if your coil was .2 that would only be 21 amps at a full battery.

 

[Obsidian...]

A 26650 is the same as 18650 (4.2V fully charged) The main difference is 18650s are much better batteries (assuming you use Samsung 25Rs, Sony VCT4/5 or something along those lines) due to the lack of manufacturers of 26650s. Good 18650s have higher pulse and continuous fire rates. With all that said and on top of all of Fluxes wealth of knowledge, yes the .5 build of the Atlantis is definitely "SAFE" to fire on the Mech. But by no means does that mean it'll work well.

The mech will more than likely fry the replaceable atomizers of an Atlantis (the wicking materials will burn) You might get lucky if you are running a 50/50 juice... With a Max VG (something above 80 especially) a mech with a fresh battery will be running too much Voltage/Watts at it for the wick to keep up.

Simply put, your Sigelei sends a constant amount of current (which you set) to the atty in your Atlantis and your mech doesn't. Depending on the charge of the battery, in conjunction with the MCCD & Pulse rates of the battery you are using, a varying amount of current will be sent. The wick won't be able to keep up with the coil and it'll fry the dry wick.