I use Fenix BC26R lights with 21700 or 18650 replaceable batteries and also a Lumintop B01 with 21700 or 18650 replaceable batteries. Lumintop B01 wins hands down in comparison, way better light beam, does not blind the upcoming traffic, does not shut off randomly like Fenix, takes all kind of 21700 batteries, Fenix does not. Lumintop has a warmer yellowing LED -more pleasant to my eyes .Batteries seem to last about the same. It also costs 1/2 to 1/3 the price of Fenix. My first Fenix died, the company send me another one, but It shuts of randomly on downhills when the bike hits some rough surface like the first one I had. It is pretty dangerous to decent in the dark all of a sudden. I always use Fenix with another light as a backup. Fenix also refuses to charge the battery when plugged it with USB sometimes.

https://fenix-store.com/collections/...46923818893608
https://lumintop.com/product/b01/