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    Archive of Safety Information ALL Vapers Should Know! 
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    Bluelight Crew Vaya's Avatar
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    Battery Safety & Ohm's Law



    {Content reprinted from www.onvaping.com with permission by the author, Brennen Phippen}

    Do not overcharge or over-discharge.

    To combat this, do not leave your batteries in any charger without supervision. Make sure that you are able to see or check on the charger every 15-30 minutes. This way when the charger indicates that the batteries have been fully charged, you can remove them from the charger. Leaving batteries in a charger all night long or longer can cause them to be overcharged, which can result in battery failure. Charging your battery over 4.25 volts can shorten its life-cycle and going over 4.5 volts can cause it to burst. Cease using your charger if this ever happens.

    Our recommendation on a good charger: Nitecore D2 Charger (2 Bay) or Nitecore D4 Charger (4 Bay)

    Recharge batteries with a resting voltage below 3.6V as soon as possible.

    Leaving LiIon batteries in a discharged state will incur irreversible damage – creating a loss in capacity and a loss in cycles.

    Determining the exact voltage can be tricky, unless you have a multimeter. If you are delving into the world of mechanical mods and RBAs (ReBuildable Atomizers), or making your own coils, a multimeter is a must have device because you can use it to test your coils and your batteries. Sure, you can always use a battery tester, but the majority of battery testers are not equipped for the types of batteries that are used in mods, or even test batteries under load condition.

    Do not short circuit your batteries.

    Short circuiting can cause a huge surge of current that will potentially burn out your battery, damage your mod, or even your face!

    Short circuits happen when the voltage from a battery is discharged through a low resistance wire at a discharge rate that exceeds the battery’s upper amp limit. Short circuiting a battery is very close to what a mechanical mod with a sub-ohm coil is doing, except you are trying to keep the resistance under the upper amp limit – there’s a fine line that you have to be careful of when sub-ohming.

    Do not let your batteries touch each other or other metallic items.

    Keeping your batteries loose, such as in your pockets, is a good way to have your batteries fail and seriously harm you. There are battery holders and covers to keep your batteries safe. Get some – now.

    Do not dispose any battery in a fire.

    This is just common sense people. There are dangerous chemicals in batteries. If you try to burn your batteries they’ll release dangerous fumes and will probably explode. Do yourself, and the rest of the world, a favor by taking your old batteries to a battery recycling center.

    WHAT’S IN A NAME?
    Let’s take a look at the specifications of AW IMR batteries for a moment:

    IMR16340 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 550mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 1.5A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 4A
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    IMR14500 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 600mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 1.5A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 4A
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    IMR18350 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 700mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 2A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 6A
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    IMR18490 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 1100mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 3A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 15C
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    IMR18650-1600 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 1600mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 4.5A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 15C
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    IMR18650 -2000 Specifications:

    Nominal Voltage : 3.7V
    Capacity : 2000mAH
    Lowest Discharge Voltage : 2.50V
    Standard Charge : CC/CV ( max. charging rate 2A )
    Cycle Life : > 500 cycles
    Max. continuous discharge rate : 10A
    Operating Discharge Temperature : -10 – 60 Degree Celsius

    Determining Your Maximum Discharge Rate

    The most important specification to pay attention to is the “Max. continuous discharge rate” for each battery. Each battery has a number and a letter, either measured as A or C (30 Amps or 15C). Look at the IMR18650-1600 for example. If your battery has a maximum continuous discharge rate of 15C, this means the battery is rated for 15 times the capacity of the battery measured in amps. So a battery that sits at 1600mAh, which equals 1.6Ah will have a max continuous discharge rate of 15 X 1.6 = 24A. There is a chart below which has the max continuous discharge rate in Amps of some common batteries.

    You should always determine what your max continuous discharge rate is in Amps (which many of the new and popular batteries have already) to keep your math consistent and mind at ease.

    HOW TO USE THIS INFORMATION EFFECTIVELY
    • Knowing the max discharge rate in amps is only half the battle.
    • How do you know if your coil or atomizer/clearomizer/cartomizer won’t short circuit your battery? Simple, use this equation: battery volts / the ohms resistance of your coil = your actual discharge rate.
    • If your actual discharge rate is less than the maximum discharge rate you calculated earlier, you’re in the clear. If it’s not, you need to suck it up and rebuild a higher resistance coil.
    • Let’s take a closer look using the 18650 1600mAh battery again (for the sake of continuity). If you took a freshly charged 18650 1600mAh battery and tossed it in your mechanical mod with a very limited voltage drop, and put a .2 Ohm coil on top, you’d be running at 20 amps. To figure out this math you take the voltage running to your coil from your battery, which lets say after a full charge, the multimeter shows that the battery is sitting at 4 volts. Now, divide by the ohms of your coil. The number you get is your total amps. In this case our math is 4/0.2 = 20. So we now know that running this exact setup will push our battery to 20 amps, just 4 amps under its max discharge rate. If you were using a different battery capable of less power under the same circumstances, you would be asking for complete battery failure and the chance of possibly hurting yourself.
    • Safety PSA: Resistance in coils can have a variance of 0.2 Ohms in either direction, or +/- .2 Ohms. This means that if you build a 0.2 Ohm coil, you have to account for that +/- 0.2 Ohm variance. The coil in the above example at .2 Ohms is an incredibly unsafe coil, and I would not use nor suggest that anyone use such a coil. Because of this, I would not recommend anything lower than a 0.4 Ohm coil for 18650 1600mAh battery.


    Equation Recap

    Let’s take a look at everything you’ll have to calculate in order to determine your coils safety in order.

    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)

    2. Measure your battery’s volts with a multimeter.

    3. Measure the Ohms of your coil and subtract .2 to account for the +/- .2 variance.

    3. Calculate the discharge rate you’ll have with the coil you’ve built: battery volts / Ohms = your actual discharge rate

    4. Check to make sure that the actual discharge rate is LOWER than your battery’s maximum discharge rate.

    BUT WHAT ABOUT OTHER BATTERIES?
    Below, I have listed out the commonly used batteries by brand with their max continuous discharge rate in amps, to make your math a little easier. However, remember that you’ll need to test the battery’s volts before AND during use in order to make sure that the coil you used is safe.

    The best batteries for sub-ohm vaping are generally Sony VTC 4 or Sony VTC 5, although they are often out of stock. In that event I usually use an 18650 Efest 35A.

    Battery name and mAh Continuous Discharge Amps
    AW IMR
    Aw 14500 600 mah 4 amp
    Aw 16340 550 mah 4 amp
    Aw 18350 700 mah 6 amp
    Aw 18490 1100 mah 16 amp
    Aw 18650 1600 mah 24 amp
    Aw 18650 2000 mah 10 amp
    Efest IMR
    Efest 10440 350 mah 1.4 amp
    Efest 14500 700 mah 5.6 amp
    Efest 16340 700 mah 5.6 amp
    Efest 18350 800 mah 6.4 amp
    Efest 18490 1100 mah 11 amp
    Efest 18650 1600 mah 30 amp
    Efest 18650 2000 mah 10 amp
    Efest 18650 2250 mah 10 amp
    EH IMR
    EH 14500 600 mah 4.8 amp
    EH 15270 400 mah 3.2 amp
    EH 18350 800 mah 6.4 amp
    EH 18500 1100 mah 8.8 amp
    EH 18650 2000 mah 16 amp
    EH 18650 NP 1600 mah 30 amp
    MNKE IMR
    MNKE 18650 20 amp
    MNKE 26650 15 amp
    Samsung ICR INR
    Samsung ICR18650-22P 2200 mah 10 amp
    Samsung ICR18650- 30A 3000 mah 6 amp
    Samsung INR18650-20R 2000 mah 22 amp
    Samsung Samsung INR18650-15mm 1500 mah 23 amp
    Sony
    Sony US18650v3 2150 mah 10 amp
    Sony US18650VTC3 1600 mah 30 amp
    Sony 18650VTC4 2100mah 30 amp
    Trustfire IMR
    Trustfire 14500 700 mah 2 amp
    Trustfire 16340 700 mah 2 amp
    Trustfire 18350 800 mah 4 amp
    Trustfire 18500 1300 maah 6.5 amp
    Trustfire 18650 1500 mah 7.5 amp
    Panasonic
    NCR18650B 18650 NP 3400 mah 6.8 amp
    NCR18650PF 18650 2900 mah 10 amp
    NCR18650PD 18650 2900 mah 10 amp
    CGR18650CH 18650 2250 mah 10 amp
    Orbtronic
    Orbtronic 18650 2900 mAh 10 amp
    Orbtronic 18650 SX22 2000 mAh 22 amp

    *Article reprinted from Battery Safety and Ohm's Law
    Last edited by Vaya; 09-12-2015 at 04:15.
     

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