Bicycle specific lights are pricey. There are tons of premium, USB-C flashlights out there that use 3000mah 18650 batteries that are very practical for cycling. You just have to be a bit creative with mounting them. GoPro type flashlight mounts can be used with many of these flashlights, including bottom mounting. There are many mounting options out there.

Here’s a pic of my tiny USB-C, 18350 battery flashlight on my helmet, using a GoPro style mount.
It’s a 1,300 lumen flashlight but I use it at the 500 lumen setting which gives me close to 2 hours.