My apologies for necroing this super old thread, want to share my experience with the Fenix 1.0, this has been the only vape i ever owned.
I use it pretty often, sometimes daily and sometimes there's a couple months between usage. i always smoked on red and cleaned it weekly if i used it often. If you like having usable avb i'd smoke on blue or green though.
Bought it in 2018 for like €50 and the only thing i had to purchase were additional mouthpieces for replacement. Today, after like 6 years it finally had an issue, i looked it up but didn't manage to find anyone with the same issue. I turned it on like usual, used once before after i charged so it wasn't empty and i took like 2 hits, after that i noticed that it stopped working but for some reason the light was super still on but extremely dim, when i look at the battery indicator it's also super dim and red. i press 5x to turn it off and it won't turn off wtf? i put it in the charger, the indicator goes bright green and then fully off while still connected (at this point i thought like aight it just shorted and it's dead), i pull the cable out and it's back to the red dim, i tried pressing the button a ton of times, even holding it to hard reset to no avail, now it's just been sitting there with a red dim light that won't turn off and the heater that won't turn on..
so a bit later i tried pushing the buttons while it's connected and then it goes to the blue main light but instantly turns off right after, the only thing i can do when it's connected is press the button 5x to get it to go blue, when disconnected it goes back to the red dim light. it's probably dead or something i'll update this post if i decide to wait for it to completely run out of power or open it up.