I seen a lot of people with the Atlantis on mech mods but is it safe?
Yes, but it depends on the battery you are using. You are going to want a safe-chemistry, high-drain battery with a high CDR. A 0.5Ω coil will pull 8.4A on a fully charged battery (4.2v). That's without headroom. And since I try to never exceed 50% of the CDR of a battery I would want a +17A battery when using a 0.5Ω build. Since 10A, 20A & 30A are the most common I would use a 20A or 30A battery in this case.
The reason that I place a 50% limit is because as a battery ages the mAh of the battery degrades, as the mAh degrades ... so does the batteries c rating. (amp limit) So down the road, a 20A battery may only be a 10A battery.
If you are new to mech mods and/or rebuildables I highly recommend you spend some time with
@Baditude (one of our resident battery/safety experts) and visit his blogs. You are now 100% in control of your own safety (and others around you). Make sure you purchase an ohm reader and a voltmeter or DMM so you can measure your builds, check for shorts and measure the remaining charge on your batteries.
Baditude's Blog - Table of Contents: The blogs that address battery safety, Ohm's Law, CDR (continuous discharge rating/Amps) and how they all work together are detailed below:
BATTERIES
Battery Basics for Mods: IMR or Protected ICR?
* Another essential read to understand which batteries are safe to use in mechanical and regulated mods. Includes a frequently updated list of recommended safe-chemistry, high-drain batteries with their specifications.
Purple Efest Batteries not as Advertised
* A cautionary blog that reveals that the purple Efest batteries may not have the specifications advertised. Also includes a commentary on "continuous discharge ratings" vs "pulse discharge ratings" of battery specs.
OHM'S LAW
Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.
Explain it to the Dumb Noob: Ohm's Law Calculations
* As simple as it is to use, some people have a tough time grasping the concept. Warning: Includes graphic photos of mod explosions.
BATTERIES - WHERE TO BUY
Only buy batteries from a reputable supplier (not ebay or Amazon) as there are many counterfeit batteries being sold. Here are several reputable battery suppliers in the US.
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RTD Vapor
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Illumination Supply
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Lighthound
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Orbtronics
I know that using hybrid mods such as the SMPL wouldn't be safe with the Atlantis but why?
Too much chance of hard shorting/venting the battery. Here's a video for you:
Hybrid Top Caps & Battery Failure