i also ordered 2
UltraFire Rechargeable 18650 5800mAh 3.7V Li-ion batteries and i am wondering what OHM's i should be running that at? i do not have it yet it should be here by next thursday
but hopefully someone can help me out.
Those are ICR chemistry batteries, which are obsolete for vaping and should never be used. ICR is not a safe chemistry; they can vent flames or actually explode should they fail. Any ICR battery will not have enough amps (continuous discharge rate) to be used in today's modern vaporizers.
To repeat, do not use those Ultrafire Batteries!
What you need to purchase are IMR (lithium manganese, or Li-Mn) batteries. These are safe chemistry and high current drain. There's a list of acceptable batteries in my blog,
Battery Basics for Mods: IMR or ICR? I also recommend that you read
Deeper Understanding of Mod Batteries.
IMPORTANT: To understand what ohms to use in your RBA, you need to know the amp limit (continuous discharge rate) of your batteries. Your coil (depending upon the ohm measurement) will draw a specific amount of amps, or current, from the battery. Never build lower ohm coils than what your battery's continuous discharge rate is. You use an Ohm's Law calculator to determine the current draw of a coil.
Explain It To The Noob: Ohms Law Calculator
The below calculations demonstrate that the lower you go in ohms the higher the amp requirement from the battery becomes. (Always use 4.2 volts in the Voltage window; this is the voltage of a fully charged 3.7 volt battery.)
1.0 ohm = 4.2 amp draw
0.9 ohm = 4.6 amp draw
0.8 ohm = 5.2 amp draw
0.7 ohms = 6 amp draw
0.6 ohms = 7 amp draw
0.5 ohms = 8.4 amp draw
0.4 ohms = 10.5 amp draw
0.3 ohms = 14.0 amp draw
0.2 ohms = 21.0 amp draw
0.1 ohms = 42.0 amp draw
0.0 ohms = dead short = battery goes into thermal runaway
For example, if you make a coil which measures 0.5 ohms, it will draw 8.4 amps from the battery. You'll need to use a battery which has at least a 10 amp continuous discharge rate (CDR).
If you make a coil which measures 0.2 ohms, it will draw 21 amps from the battery. You'll need to use a battery which has at least 30 amps CDR.
IMR 18650 batteries are available with 10, 20, or 30 amps CDR. Choose the battery depending upon what ohms you will build to.
Lower Ohm Coils Will:
- Heat The Coil Faster
- Produce More Vapor
- Drain The Battery Faster
- Use E-Juice Faster
- Produce A "Warmer" Tasting Vape
Higher Ohm Coils Will:
- Heat The Coil Slower
- Produce Less Vapor
- Provide A “Cooler” Tasting Vape
- Use Less E-Juice
- Prolong Battery Life
As someone who is relatively new to vaping, completely new to rebuildables and mechanical mods, you have a lot of homework to do. If you are not willing to put in the legwork, in my opinion you have no business to be using a mech and RBA.
Information Resources for Your First RBA
