smokBox VariCool! The efficient variable voltage mod.
New Stealth Model available!
Read the Vaping Guides Review !
Hand-built and tested to perfection! Run any atomizer/cartomizer with the perfect voltage to drive them! A 3a switching regulator provides true 3.3-6.5 volt output with no heat build up. Up to 95% efficient use of battery energy means longer life!

3xAA sized box uses two Li-Ion 14500 batteries which will supply 900mah of battery life for all day use for moderate vapers. Small compact size is easy to carry and use. Don't let the size fool you it packs a big punch at 4-6 volts!
Each box is handcrafted and fully tested.
Features:
What's the difference between a switching and linear voltage regulator?
Technical answer:
Switching regulator - In a switching regulator transistors are turned completely ON or OFF like a switch. When they are on lots of current can flow but there is almost no voltage across the transistor therefore the transistor dissipates very little power. When the transistor is off there is usually a voltage across the transistor but there is no current so again there is very little power. Energy is usually stored and filtered through inductors and capacitors and regulation is controlled by varying the percentage of time on vs. off (duty cycle). The advantage to this is that there is very little heat or wasted power making this design capable of being very efficient.
Linear regulator - In a linear regulator the transistor is turned partly on so as to provide the proper resistance to the load so that the load always sees the same voltage. Since it is partly on there is a definite voltage drop across the regulating transistor and there is as much current simultaneously as the load is demanding. Therefore power is being dissipated across the transistor which turns into heat. This heat is wasted power and the reason that switching supplies are so much more efficient.
Simple answer:
Switching regulator:
Linear regulator:
Try the E-Power Dual Coil Cartomizer (EPDCC) on the VariCool!
- 1.5 ohm, 5.5ml - Black or Stainless - w/rubber tip

This is designed for the E-Power 14650 and fits it like a glove! However, you can also use the EPDCC on other 510 devices like our SmokBox Mods with the addition of the eGo-510 connector.
New Stealth Model available!
Read the Vaping Guides Review !
Hand-built and tested to perfection! Run any atomizer/cartomizer with the perfect voltage to drive them! A 3a switching regulator provides true 3.3-6.5 volt output with no heat build up. Up to 95% efficient use of battery energy means longer life!
3xAA sized box uses two Li-Ion 14500 batteries which will supply 900mah of battery life for all day use for moderate vapers. Small compact size is easy to carry and use. Don't let the size fool you it packs a big punch at 4-6 volts!
Each box is handcrafted and fully tested.
Features:
- Reliable big button switch (5 amp)
- 3 amp switching regulator
- Red LED indicator light (future models will have choices available)
- Black 3xAA A.B.S resin battery box - dimensions: (2-3/4" x 1-7/8" x 5/8")
- Sealed and reinforced 510 connector
- Master On/Off safety switch
- Easy to adjust, concealed voltage trimmer, marked at 3.8 and 5v
What's the difference between a switching and linear voltage regulator?
Technical answer:
Switching regulator - In a switching regulator transistors are turned completely ON or OFF like a switch. When they are on lots of current can flow but there is almost no voltage across the transistor therefore the transistor dissipates very little power. When the transistor is off there is usually a voltage across the transistor but there is no current so again there is very little power. Energy is usually stored and filtered through inductors and capacitors and regulation is controlled by varying the percentage of time on vs. off (duty cycle). The advantage to this is that there is very little heat or wasted power making this design capable of being very efficient.
Linear regulator - In a linear regulator the transistor is turned partly on so as to provide the proper resistance to the load so that the load always sees the same voltage. Since it is partly on there is a definite voltage drop across the regulating transistor and there is as much current simultaneously as the load is demanding. Therefore power is being dissipated across the transistor which turns into heat. This heat is wasted power and the reason that switching supplies are so much more efficient.
Simple answer:
Switching regulator:
More efficient (up to 95% efficiency)
More time between recharges
Runs much cooler
More expensive
More time between recharges
Runs much cooler
More expensive
Linear regulator:
Less efficient (20-60% efficiency)
Less time between recharges
Runs much hotter
Less expensive
Less time between recharges
Runs much hotter
Less expensive
Try the E-Power Dual Coil Cartomizer (EPDCC) on the VariCool!
- 1.5 ohm, 5.5ml - Black or Stainless - w/rubber tip

This is designed for the E-Power 14650 and fits it like a glove! However, you can also use the EPDCC on other 510 devices like our SmokBox Mods with the addition of the eGo-510 connector.

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