RBAs in general place a higher demand on batteries than other juice delivery devices. High drain batteries, called IMR or safe chemistry batteries (Li Mn) are able to the supply the higher bursts of energy required than protected ICR batteries (Li Ion).
I don't recommend starting out with sub ohm coils unless you already have had success with standard resistance coil building. Once you get to 0.8 ohm or less, a minor change in lower resistance can have disasterous results to your gear or you. Just accidentally touching your wick/coil when removing/replacing the top cap can change resistance, as well as a loosened thumb screw. Sub ohm vaping also requires high quality IMR batteries that have a higher continuous amp output, of which there are only a few available currently.
I've written a blog article to help new RBA users get started on the right foot. Please pay attention to the topics on multimeters, battery and mod safety. Strongly consider using a vape safe mod fuse - it will be your only safety net if using sub ohm coils on a mechanical mod. Vent holes and a collapsable hot spring only prevent your mod from becoming a potential pipe bomb once it decides to become a firecracker.
http://www.e-cigarette-forum.com/forum/blogs/baditude/4454-7-advice-tips-vapors-looking-try-their-first-rba.html
E- | Cigs | Mods | Batteries | Safety | Vaping | Vape | Safe | TheVapeSafe.com
http://www.e-cigarette-forum.com/forum/rebuildable-atomizer-systems/432181-need-help-picking-best-battery-sub-ohm-vaping.html
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Research into
micro coils. These are considered to be more safe than sub ohm and have similar results to sub ohm.
http://www.e-cigarette-forum.com/forum/rebuildable-atomizer-systems/416271-micro-coils-increase-vapor-flavor-th.html
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PBusardo has an article on batteries for mods on his Taste Your Juice website. Here is an except:
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If you’re into those ultra low resistance coils (which I don’t recommend BTW – I personally believe .8 ohms and up should be PLENTY good enough) KNOW YOUR BATTERY!!! Be sure that the battery is capable and rated to generate the amount of amps required by your setup! For example:
- Setup 1 = 1 ohm coil with a loaded voltage of 4.0V (just an example). Using Ohms law, Amps = Voltage/Resistance = 4 Amp Draw. Easy for most batteries!
- Setup 2 = .3 ohm coil (which I DO NOT recommend) with a loaded voltage of 4.0V (again, just an example). Using Ohms law, Amps = Voltage/Resistance = 13.3 Amp Draw. Can your battery support that?
A NOTE ABOUT C-RATINGS
The C-Rating of the battery defines the maximum draw (in amps) that the battery is capable of. To calculate the max amp draw you need the C-Rating and the mAh of the battery. For example a 2000 mAh battery rated at 10C would be:
Max Amp Draw = (mAh / 1000) * C-Rating
(2000 / 1000) * 10 = 20 Amp Max Draw
Note: Running your batteries at their C-Rating will decrease the overall life of the battery.
The C-Rating also indicates the amount of time the battery can support that discharge rate. A 1 C battery can support the calculated draw continuously for 1 hour. 2 C would be 1/2 of an hour. 10C would be 1/10 of an hour."
