I'm having a problem with my New tree box in TC mode; I get a "weak battery" warning, some times it will fire most of the time it wont. It works fine in power mode, but i haven't ventured much above 40W yet. I am using a freshly charged Sony VTC5, tried both the Starmax (.2 NI200) and the Trion (.4 SS). I only been at this for about 3 Months (haven't smoked a butt since after 20 years!) This is my first TC mod with a replaceable 18650, so i'm not sure if i'm using the wrong type of battery or if the problem is with the unit. I have a Istick 40W TC and it works fine in TC with my Starmax pro. I use the batteries in my Kanger Subbox mini and they work fine as far as i can tell with the .5 coil. Any thoughts would be very helpful. Its a a new(er) mod so there is not a lot of info out there on the unit and from the videos i have watch, it seems that i have the settings correct.