I rode roughly 400-500 miles in the dark last winter (too lazy to dig through to get an exact number). I use two cheap flashlights that take 18650 batteries. One aimed low and wide and when needed, I turn on the second and it's aimed higher. The main light starts to get a little dim but can make it the 1.5 hours but I a carry a spare battery just in case or just use the other one. Simple, cheap. Pitch black rural road and bike path route that I've done a 100 times before, that being said, it is still unpredictable, I stay under 20ish. I ride with one at all times every ride regardless of season or time as a flasher if needed. In the perfect world, I'd have a helmet light but I can't stand any additional weight on my helmet.

I don't want wired battery packs and I want the ability to swap batteries