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About IMR Batteries for MODs

Even if you are a seasoned vaper and have been building coils for a long time or if you are new to it, it is an absolute necessity that you have a good understanding of vape MOD batteries. Batteries are actually the most important element in the vapor MOD. They are more important than your atomizer and your coil builds. Lithium manganese (LiMN) batteries supply low voltage electricity at a relatively high amperage. With this type of battery, you have to make sure you know the limits of what you can draw from them, especially when you get into low sub ohming and start pushing the limits of your equipment. LiMN batteries are safer than Li-Ion batteries, but if not used properly, LiMN batteries can be dangerous. So here are a few pointers to make sure you treat your battery well and safely enjoy your MOD. 

MOD Batteries Safety Tips:

  • Never Overcharge or Over-Discharge LiMN MOD Batteries:

If you own a recent regulated box MOD that holds just one battery and that has a USB port for charging, check the User Manual for the safety features included in your MOD. Make sure it is protected against battery overcharge and low charge. If you have these protections, then the box MOD should prevent battery related issues. Still, you should know about your batteries.

If you don’t have a protected pass-through regulated Vape MOD, or if you have a MOD that require removing the batteries and charging them with an external charger, then you need to be extra careful with your batteries. Never leave your batteries in any charger without supervision. Check on your batteries regularly while they are charging and remove them from the battery charger as soon as they are fully charged. Leaving batteries longer than necessary in a charger 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. We recommend you use a charger with overcharge protection.

Check our selection of battery chargers. They are able to automatically detect the type of batteries you use and they will activate their IMR optimization charging system that will monitor the entire charging process making sure the end voltage is within safe limits, which will help extend the battery life.

  • How Much Can an IMR Battery Discharge?

As much as overcharging LiMN batteries is a problem, letting them discharge too low is also a concern. LiMN batteries that are left in a discharged state will get a permanent loss in their charging capacity resulting in a reduced life cycle and the number of times you will be able to recharge them.

Don’t let LiMN batteries drop their resting voltage below 3.6V. Recharge as soon as possible.

To know the charge of your battery and properly assess when to recharge with a box MOD, check the OLED screen. You will see an indicator of charge and your box MOD will give you an error message if your battery is too low. With a mechanical MOD, since there is no OLED screen, you can use a vape MOD Voltmeter. These voltmeters are specially made to screw onto the 510 connection in place of the vapor MOD atomizer. In addition, they can also help you calculate your voltage drop. As an alternative, you can also use a multimeter to test your battery. If it reads 3.6V or lower, it's time to charge your battery.

  • Do Not Short Circuit Your Batteries:

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. 

This can happen to the battery inside or outside your unregulated MOD (most regulated MODs are protected against short circuit, just make sure you check your User Manual).

When the battery is outside the vape MOD, make sure it doesn’t touch any metallic items or the contacts of another battery. Make sure you don’t carry them loose in your pocket. If the battery short circuits in your pocket, it can get extremely hot and burn you. It could even explode. To be safe, you can get a plastic battery cover for your spare batteries.

Once the battery is in your mech MOD, you have to watch for shorts. First, you have to make sure that your coil builds are sound. Test them with an ohm meter to check for shorts and also to make sure that they were built at a resistance above the minimum your battery can handle. When you are using an atty with low sub ohm coils, you are actually getting close to short circuiting your vape MOD battery.

Also, do not build your coils on your MOD. This will ensure that you wont misfire the MOD with the potential risk of short circuiting the battery. We recommend you use a coil winding jig tool to hold the deck of your rebuildable atomizer while you are working on it. Again, make sure you test your builds on an ohm meter before you screw it back onto your vapor MOD. Also, use ceramic tip tweezers to work on your coils once your atty is on your MOD to adjust the coils or rewick. The ceramic will avoid any risk of short circuiting your coils.

  • Properly Dispose of Your Battery:

This should go without saying, but just make sure you dispose your vape MOD batteries in a responsible way. Never dispose them into a fire. LiMN batteries are made with chemicals dangerous for the environment and also dangerous when exposed to high temperatures. They will release dangerous fumes and can explode. We encourage that you to take your old batteries to a battery recycling center. 

How to Choose a Good IMR Battery?

IMR are round LiMN batteries. They are also called High Drain, Safe Chemistry, or Unprotected LiMN batteries. They are the safest batteries available for vaping. Using safer chemistry, they don't require a built-in protective circuit unlike Lithium-Ion (Li-Ion) or Lithium Cobalt batteries (ICR). They have higher tolerance to stress, but may still vent if failing. Failures with LiMN batteries are much less dramatic than with a Li-Ion or ICR, which are quick to vent violently in flames and possibly explode.

Bottom line, IMR batteries should be used with regulated box MODs and also with unregulated MODs.

Depending on your MOD setup, you will choose a shorter IMR 18350, medium length IMR 18500, longer IMR 18650, or a thicker IMR 26650. Check your User Manual for the size required if you are not sure.

We recommend you use Efest batteries. Here are the specs and some additional information about these batteries:

EFEST IMR 18350 Specifications:
  • Nominal Voltage: 3.7V
  • Capacity: 700mAh
  • Lowest Discharge Voltage: 2.5V
  • Standard Charge: CC/CV (max. charging rate 2.0A)
  • Battery Top: Button top
  • Battery Type: LiMN
  • Max. continuous discharge rate: 10.5A
  • Operating Discharge Temperature: -10 – 60 Degree Celsius
    EFEST IMR 18500 Specifications:
    • Nominal Voltage: 3.7V
    • Capacity: 1000mAh
    • Lowest Discharge Voltage: 2.5V
    • Standard Charge: CC/CV (max. charging rate 2.0A)
    • Battery Top: Flat top
    • Battery Type: LiMN
    • Max. continuous discharge rate: 15A
    • Operating Discharge Temperature: -10 – 60 Degree Celsius
      EFEST IMR 18650 Specifications:
      • Nominal Voltage: 3.7V
      • Capacity: 2500mAh
      • Lowest Discharge Voltage: 2.50V
      • Standard Charge: CC/CV (max. charging rate 2.0A)
      • Battery Top: Flat Top and Button Top
      • Battery Type: LiMN
      • Max. continuous discharge rate: 35A
      • Operating Discharge Temperature: -10 – 60 Degree Celsius
        EFEST IMR 28650 Specifications:
        • Nominal Voltage: 3.7V
        • Capacity: 3000mAh
        • Lowest Discharge Voltage: 2.50V
        • Standard Charge: CC/CV (max. charging rate 2A)
        • Battery Top: Flat Top
        • Battery Type: LiMN
        • Max. continuous discharge rate: 64A
        • 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” of your battery. Look on the sleeve of your battery for a number followed by an A or C, for example 35A or 15C. Usually, it will also say “Discharge Current” in front of that number like the Efest does. If you find a number followed by the C letter like 14C for example, it means that your battery is rated for 14 times the capacity of the battery measured in amps. So if your battery is a 2.5Ah (2500mAh), it will have a max continuous discharge rate of 14 X 2.5 = 35A. 

        What Builds Can I Use In My Atomizer with My Battery?

        How do you know if the coil in your atomizer will not short circuit your battery?

        If you want to build a new coil in your rebuildable atomizer, you can use a Ohm’s law vape App. Type in your battery voltage (3.7V) and the max continuous discharge rate (35A for instance with the Purple Efest IMR 18650) and it will return the minimum resistance you can build your coil at. Or you can do the math yourself using this formula: R=U/I (R= the ohms resistance of your coil, U = battery volts, and I = your actual discharge rate).

        Click on this link to learn more about coil building: About Rebuildable Atomizers for MODs

        If you already have a coil built in your Rebuildable Atomizer and want to know if you can use it with your battery, use a vape ohm meter to confirm the resistance as well as to make sure it doesn't have a short. Always test your coil builds before you put them on your MOD and fire them. Find the Actual Discharge Rate for your coil and see if it is compatible with your battery. You can either use an Ohm’s law vape App or you can do the math yourself using the formula I=Um/R (I = Actual discharge rate for the coil, Um = maximum battery volts, and R= the ohms resistance of your coil). . With a voltmeter, measure the voltage of your battery at full charge. It should be around 4.2V and no higher than 4.3V. If your actual discharge rate is less than the maximum discharge rate you calculated earlier (keeping a safe margin of error), you’re in the clear. If it’s not, you will have a great opportunity to practice your coil building skills on a new safe build.

        Here is a practical example using a purple Efest IMR 18650. This battery has a maximum voltage of 4.2V with a vape voltmeter and we know it has a maximum discharge rate of 35A. So if you have a 0.2 Ohms rebuildable atomizer on your mechanical MOD, and assuming a very limited voltage drop, you would be running at I=Um/R = 4.2/0.2 = 21A. Knowing that this coil will have an actual max discharge rate of 21A, compared to the 35A that the battery is rated for, you know that you are well within the safe range.

        Now if your coil is 0.13 Ohms, you would be running at I=Um/R = 4.2/0.13 = 32.3A. That’s getting close to the 35A Maximum Discharge Rate of the battery, so you should really increase the resistance or your coil to 0.2 Ohms and be safe.

        And if you change your battery, make sure to again verify the coils against the Maximum Discharge Rate of that new battery. Also remember that measuring tools have a margin of error, so make sure you account for it when you build and test your coils. Vape Safe!

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