It used to be that 2 out of 4 of mine had this bug. Then, a week or so ago, I decided to do an emitter swap on one of the ones that worked with 14500s. A few days later, it developed the problem, too, despite never seeing much use before or after the emitter swap.
So, I pulled out my once tested and otherwise unused UT01. I swapped the emitter in, and noticed along the way that the reflector was no longer threaded like it had been on the first three (so they’d done some redesign). Now, tonight, after a few days of minimal use, it now has the same problem.
I thought I had one of the good ones. Worked fine for a month or two, then it developed the same issue as everyone else’s. Not buying Utorch again in a hurry, this issue was known LONG before I bought mine, seems like they had no interest in solving it.
I have UTOCH UT01 for about a year and it works without any problems. I use it irregularly. After reading today’s answers, I measured the battery. After a few months when I did not use the lamp, it has a voltage of 3.9 volts. So my UTORCH does not have a large parasitic current drain. I only use the Li-ion 14 500 battery.
