Whoa! Three batteries in series using (unknown quality) batteries and (unknown quality) charger? That’s a big red flag!
Since you’re already familiar with li-ion batteries and safety precautions, I’d suggest you consider the $31 Shadow JM35, 2x26650 version, MT-G2 emitter (neutral white) using the discount code from M4D M4X:
It can operate on either 2 x 18650 batteries for your convenience, if that’s all that you have. Or you can use 2 x 26550 batteries for much longer run times.
I have one. It has the heft and feel of one of the old-fashioned Maglite 2D flashlights. It’ll fit your utility belt ring perfectly and won’t fall out.
It’s got a nice general purpose beam pattern. Not too wide and not too focused. And the hot spot feathers (blends) smoothly to the spill areas. It’s plenty bright at 1900 lumens. Neutral white tint. Just a great beam!
And it has a dual switch. Tail switch turns it on and off. Side switch to change modes (and it remembers the last mode used). I think that this is the best UI for a general purpose light. Turn it on by clicking the tail button. Turn it off by clicking the tail button. For me, I always use the same mode (medium - because that is more than bright enough for 99% of my uses). Consistent. No doubt in my mind what I’ll get when I click it on. And for the rare occasions when I need lower or higher beams, the side switch affords easy access.
I’ve got a lot of brighter flashlights in my collection, but this is the one that sees the most use, day-in and day-out. It just works.