I feel you guys might have a bit more experience than me in the area but I'm a bit of a flashlight fanatic just as a home hobby kinda thing, I love good, reliable, longlasting (both in charge and life) lights.
I've got countless numbers of 18650 lights and rechargeable 18650 lights, normal 2-3x AAA/AA batteries, old school bulbs and LED all of which I've been mildly disappointed with but would take over anything from my grandparents or parent's generations, though I've never taken one of those old ones and put an LED in it, I don't think it'd be much different. Overall they all drain too fast, they all break too easily or have small parts that were made of bad materials.
That's all till I started looking at Anker as more than a charging company, while looking for battery packs I ran across their flashlights and it so happened a guy at work got the Bolder lc90 which seemed a little big for the edc flashlight I was looking for, so I went with the Bolder lc40. I've used it damn near every single day since I got it a couple months ago and only had to charge it twice, with using it at work and at home for working on vehicles, under the house I just bought (too frequently there) and just in general cause it's so compact. I use it over literally all of the other flashlights I have, not that any were super expensive or anything but this thing is only 20 dollars and I'd buy another 10 if this ever dies cause it's just that great.
Everyone talking about it being a waste once the cell that comes with it dies, how many batteries do you think you go through in the lifespan of a good rechargeable cell? How much do those batteries cost? I know prices on lights varies greatly but for the 20 I spent on this light I'd probably get 2 years worth of batteries, so to me it 100% evens out, if I don't lean towards rechargeable simply for convenience.