Watts = Battery Voltage / Ohms
The maximum current allowable for a given battery is listed in amps as the maximum continuous discharge rating, or calculated from the “C rating” multiplied by the battery’s capacity.
For maximum safety, check the amperage or “C” rating on any battery you use to ensure it is capable of performing to your desired resistance (Ohms) settings. When in doubt, buy a larger or “better” battery than what you may think will be okay. One battery may be capable of powering a 2.2 Ohms coil with ease, but the same battery may seize while attempting to power a sub-ohm coil of 0.20 Ohms. If overexerted and stressed, a Li-Ion battery that cannot handle the resistance load will simply give up.
In an unregulated mechanical mod, Li-ion batteries will exert 100% of their current charge, measured in volts. For example, a fully charged 18650 battery gives out an average of 4.15V – 4.20V. The battery is “strongest” and most “powerful” when fully charged. A battery in need of recharging and incapable of creating enough power to operate reads an average of 3.25V-3.65V.
Any mod without battery vent holes has the potential to become a “pipe bomb”. This “pipe bomb” now has a good possibility of causing severe bodily injury and an even bigger blow to your wallet.
A mechanical mod with suitable vent holes can prevent this pressure from building up, by releasing the rapidly expanding gases before it progresses to dangerous levels.
Mechanical mods with small or non-existent vent holes can be very unsafe and downright dangerous if the proper precautions are not taken.
Think of a mechanical mod like you would any other power-producing machine. Take a car for example. In order to safely and effectively operate a motor vehicle at dangerously high speeds, the brakes must be in good working order along with the many other safety mechanisms and features of modern-day automobiles.
- A car traveling at highway speeds approaches an accident ahead blocking all lanes of traffic. The brakes must not only be in good working order, but they must also be compatible to the specifications of the car.
- High performing advanced vaporizers require similar safety features "in case" anything happens. Along with basic knowledge and 4th grade math skills, we can all vape safe!
- Never use a mechanical mod without adequately sized vent holes.
Use this Ohm's Law Calculator if you have any doubts at all. Just enter Any 2 Known Valuables (resistance, voltage, wattage, amperage)
Always do your math! PRIOR to vaping a rebuildable atomizer or tank on a mechanical mod or unregulated device, be sure to check the following:
(1) Calculate your battery’s capacity in amps: capacity in mah / 1000 = capacity in amps.
(2) Calculate the maximum discharge rate if measured in C: maximum discharge rate = (battery capacity in amps) x (continuous discharge rate).
(3) Measure your battery’s resistance (Ohms) prior to placing on your mod to ensure there are no shorts that could result in battery failure.
(4) Subtract 0.2 Ohms from the ohm-meter’s resistance reading to account for the +/- 0.2 Ohms variance. No matter how expensive, ohm-meters are rarely 100% accurate.
(5) Calculate the discharge rate vs. the coil’s resistance (Ohms): battery volts / ohms = actual discharge rate.
(6) Make sure the actual discharge rate is LOWER than your battery’s maximum discharge rate.
(7) Make sure the mechanical mod’s firing button and inside threads are clean and free of any dirt, oil, lint, metal burrs, etc. Anything preventing the firing button’s contact pin from returning to the recessed area of the button where the contact pin is no longer connecting to the battery can be potentially dangerous. A poorly machined thread or even a piece of pocket lint can cause the firing button to become stuck in the ON position. Remove the top portion of the mod with the atomizer/tank, or the bottom firing button from the body of the mod immediately. This allows the battery to “breathe” and vent much easier and prevents an ER visit, which in this case is very probable.
Most, if not all PV’s & Mods with adjustable wattage and voltage settings (Variable Voltage/Variable Wattage, VV/VW) are equipped with internal protections against battery failure. These types of mods have “minimum resistance requirements” and will not operate if it detects the coil resistance is dangerously low or if there is a short.
- Use Li-Mn cells, or protected Li-ion cells. (SONY VTC4, Efest 35A, Efest 38A, IMREN, 40A)
- Make sure the C rating on your battery can handle the resistance load of your atomizer.
- Don’t overcharge. Even if your charger has protection against overcharging- it could fail.
- Stacking batteries is not suggested and hugely warned against. Stacking improper batteries can place a strain on the battery cell and cause venting and/or explosion. When stacking batteries, the risk goes up.
- Do not store a fully charged battery for long periods of time. Always store batteries in a plastic or similar container/protection case, never loose in your pocket.
- Think very carefully before buying a mechanical mod with no physical safety features. In order to safely use this mod, additional devices are required such as an ohm reader or a high-drain rechargeable battery, 30 Amps or greater.