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What batteries can I use in the Firewood 4?  Batteries used in Firewood 4 must be 18650 size and MUST BE RATED FOR AT LEAST 20A OF CONTINUOUS DISCHARGE CURRENT.  Using improper batteries can cause equipment damage, which can lead to property and/or personal injury.

Here is a list of known good batteries:

  • Efest IMR 18650 3000mah 35A Flat Top
  • Samsung 25R
  • Sony VCT4, VCT5, VCT6

Beware of counterfeit batteries!  Some good sources of genuine batteries are: (they sell individual, not just bulk)


Are the batteries used in the Firewood 4 safe?  I have heard that these types of cells are dangerous.  The greatest risk with 18650 cells is an accidental short.  The risk is due to the extreme heat produced.  If you shorted one of these cells with a piece of wire (i.e. connect the positive to negative terminals using the wire), the wire would almost instantly turn red hot and possibly melt before you could even react.  DO NOT try this.  That "wire" could be anything metal like keys, coins, etc.  The heat caused by a short could burn you, cause a fire by igniting anything flammable that is nearby, or cause catastrophic damage to the battery which could in turn cause it to vent out hot toxic gasses.  This is why you always need to transport these cells either in the device they are being used in, or in a container intended for the purpose.  You need to ensure that there is no chance for the cells to be accidentally shorted.

Other risks are from over discharging or over charging the cells or using the wrong type of battery.  The firewood automatically turns off when it detects that the battery level is getting too low, so over discharging is not possible.  As far as charging is concerned, that is handled by the external charger and must be done with a charger that has circuit protections to avoid overcharging (like the Nitecores we sell) and must be done according to the instructions provided with whatever charger you use.  The battery type must be a high drain 18650 that is rated for at least 20 Amps of constant discharge current.  Do not use a battery that isn't clearly rated for 20A constant discharge! (more than 20A is ok)

If you use an approved charger, and use the right cells, and don't allow the cells to accidentally short then 18650 cells are safe.


What do the buzzes indicate after the initial buzz? After the temperature is set, the buzzes mean that the firewood has detected the start of a draw. Due to how the draw sensor works, it can also buzz when you are drawing too fast, but you have to draw pretty hard for that to happen, especially if the battery is fully charged. If you get a buzz in the middle of a draw it is more likely due to drawing too slowly. If you draw too slowly the firewood can have gaps in the draw detection and think that you are starting a new draw. In that case you can simply ignore the buzzes or draw a little faster.


Is there a way to adjust the temperature setting ranges?  Yes, here is how to change Firewood 3/4 temperature settings in 7 degree increments.

  1. turn on the vape
  2. wait until battery indicator buzzes are done
  3. click the button 8 times
  4. the vape will make 8 quick buzzes
  5. click the button 5 times
  6. the vape will make 5 quick buzzes
  7. click the button between 0 and 8 times:

0 clicks = set temp shift to 0
1 click = set temp shift to approx +7 degrees F for all heat levels
2 clicks = set temp shift to approx +14 degrees F for all heat levels
3 clicks = set temp shift to approx +21 degrees F for all heat levels
4 clicks = set temp shift to approx +28 degrees F for all heat levels
5 clicks = set temp shift to approx +36 degrees F for all heat levels
6 clicks = set temp shift to approx +43 degrees F for all heat levels
7 clicks = set temp shift to approx +50 degrees F for all heat levels
8 clicks = buzz back the current temp shift setting then shut off.

After you set the level the unit will automatically shut down.  The settings are saved between power downs so you only need to set it once.

 What is "Party Mode" and how do I use it?  Party Mode allows you to extend the length of time it will hold the set temp after the end of a draw.  The default is 1 sec. To set the party delay, you access it similar to how you adjust the temperature ranges (see above), except that instead of doing 8 clicks then 5 clicks followed by your selection, you need to do 8 clicks, then 8 clicks again, then your selection.  Your selection should be between 0 and 8 clicks.  The heat will be held at the end of each draw for an extra delay that equal the number of clicks times 2 seconds.  0 clicks sets it to the default of 1 second and 8 clicks buzzes back the current setting.  After you set the party delay the unit will automatically shut down. Setting the party delay will NOT activate it. You can activate it at any time after starting a session (after heat level has been selected) by clicking 6 times quickly. For the rest of the session the party delay will be whatever you had previously set it to. It must be reactivated each session when you want to use it, but the delay setting is persistent.


What is Quick Start mode and how do i use it?  Quick start mode is a way to turn on the vape and set the temp setting in one step.   To do Quick Start, before you turn on the device you can click 2-4 times (for heat level 2 - 4) followed immediately by the normal button hold to turn it on. It will turn on, buzz back your heat level, pause, then buzz the battery level, while heating up to that level.