You need be able to answer your own question if you are going to build.
If you are new to rebuildables I highly recommend you spend some time with Baditude (our resident battery expert) and visit his blogs. You are now 100% in control of your own safety (and others around you).
Baditudes Blogs. The blogs regarding batteries & and ohm's law are listed below:
BATTERIES
9. 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.
11. Deeper Understanding of Mod Batteries Part 1
* For those who want to learn the differences between IMR, IMR/hybrid, and ICR batteries. What do those numbers and letters on batteries mean? What's an amp rating?
17. 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
14. Ohm's Law for Dummies (Vapers)
* My attempt at explaining Ohm's Law in layman terms and how it relates to vaping.
16. 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.