iJust avoid Joyetech entirely.
Eleaf makes the istick. - I have never owned an Eleaf Istick anything.
You may want to add them to the "Avoid Entirely" list. (I have when I heard of this problem about a year ago)
Back in the day when ego batteries were as high tech as you could get the Joyetech Ego was the best of all of them.
As a matter of fact they are the ones who named it an "Ego Battery"
The name stuck and all batteries of that size with the fire button on the side were called ego batteries.
Kind of like how Kleenex is a popular brand of facial tissue and some people just call all facial tissue "kleenexes" now.
Joyetech also invented ego threading as well (i'm really glad that ego threads didn't become standard and we stuck with 510 threading.)
I have two mods with joyetech chips one is the Cuboid made by joyetech
and the other is the one they are getting sued over = wismec reuleaux rx200
I personally don't vape over 100 watts max
I stay between 40 and 60 mostly
Actually I use TC a lot now because when you limit the temp a coil can reach it can not cook the juice.
Burning or cooking the juice may release a very small amount of toxins.
So I prefer the Cubiod because it is much smaller in size. For $39.99 it's a great dual 18650 mod
The whole deal where the batteries do not come out of the mod is what turns me off about the istick series and the Evic VT.
I like to be using a set and have a set to put in while i'm charging the drained ones.
That and i can choose which brand and spec of battery I am putting into the mod.
I have a feeling that Eleaf may be using inferior cells in their istick50 device because I have heard at least 2 dozen stories all the same as the story above.