Evic VTC Mini - Safety Measure or Glitch?

[DarrellG]

Wanting to test the waters on a lower than usual (for me) build, I built a .13 dual coil 22 gauge kanthal build on my BMI goldie for use on my evic. My only means of reading the resistance of my build is through the evic, so, .13 is what the evic is reading. I've never built this low before (I'm typically in the .3 to .5 range) and just wanted to safely experience the differences for myself. I'm using a green Samsung 25R battery. I've had it in use for about 6 months, taken very good care of it, no issues and it was fully charged at the time. As I understand the 25R should be perfectly fine up to 20 amps. I know it can go higher, but I'm not interested in purposely pushing the limits of safety. I just wanted to experience a more intense vape to see if it was my thing or not.

At 53 watts in wattage mode the amp draw reads 19.9 amps. I take a few 2-3 second pulls. The vapor production is fine, not a massive difference in what I'm already accustomed to with my higher resistance builds to be honest. I decide to up the wattage to 60 watts, it reads 20.4 amps. I take a couple short pulls, not much of a difference. I up it to 75 watts, again the display reads 20.4 amps, but this time only for a split second, followed by the display going completely blank. A second later the display returns and the device has reset to 65 watts. I repeated this process two more times with similar results; the only differences being the reset wattages, 56.8 and 65, respectively.

I honestly don't mind if I can't use this build at 75 watts. I won't lose any sleep over it. I'm just uncertain of what's going on. Is this a result of a safety mechanism in the chip? Or does it sound more like a glitch of some sort?

I'd really appreciate any input. Thanks.

 

[bussdriver]

If you lower your wattage back down and it works properly then it is simply safety circuits causing it to shut down. You say that it never goes above 20.4 amps, even when you increase the wattage. That is probably your mod telling you that you've reached the maximum output in amps. Asking it for more causes it to shut down and decrease the wattage for you, back down to a lower wattage where the amp draw is within range.

 

[Susan~S]

There are two different amps with regards to safety.

• The amps the chip sees to protect the board (what you are describing).
• The amps the battery draws.

The chip in the board will protect itself by throttling down the wattage. However the amps the battery see is calculated based on the following:

• Calculating Battery Current Draw for a Regulated Mod

Bottom line, the mod will protect itself. However, it has no idea if the battery is being stressed too hard or not. And a battery being stressed too hard will have a shortened life and, if stressed hard enough, can vent or worse.

 

[DarrellG]

Thanks for the input, Bussdriver and Susan.

I should have figured it was a protection for the circuit board, because, like you say, I couldn't imagine how the chip could identify battery type. I just couldn't put two and two together for certain.

Thanks for clarifying.

 

[dc99]

All mods have a sweet spot where your not stressing the mod and you still get the maximum output. The mini seems to be happiest around .5-.7. If Im not mistaken the mini has a 20a limit on the board so that would be why it throttles back when you try to pull more.

 

[DarrellG]

Thanks, dc99. This is all new to me because I've never really pushed the device before.

Not sure if this info is dated yet, but for anyone interested, Busardo has some relevant data on this issue: which I found via a discussion here: Evic vtc mini update 2.0 • /r/electronic_cigarette from around roughly the same time.

I think I'll be making a new build and shoot for around .35 with some 26 gauge to see what it produces at 75 watts. I'm finding that I'm not a fan of 22 gauge thus far. Feels like I'm waiting for an electric stove top to warm up.