Ohhh that headlight with a battery pack sounds interestingI have a bunch of old 18650 powered cree bulb flashlights that are years old and funny enough 2 MagLights 3D cell ones from ULine that I put LED bulbs in. One of The mag lights lights is using 3D cells. The other one is using rechargeable AA’s with D cell adapters so it’s nice and light but still looks the part. Also a 3 bulb horizontal layout LED flashlight. Ohh and a head torch that has an external battery pack with a brick of 4 18650 cells that I also use on my bicycle with a lens that converts the beam to a flat wide pattern.
I have to stay out of this thread as my will kill me if I buy more flashlights. LOL!