Just my little thing for this.
Go for the gladius. There are protected rechargeable batteries
C123 which work on full power for about 40min. I get these here in germany from miraclestore. I have one set in the flashlight and one set for bonus in pocket. And the BEST is : NO FLICKERING, only after the runtime for about 4 times and than the light is off, no dimming or so, instant off.
For me is this no problem.
The thing with the flashlight in the pocket and the locked tailcap:
in my oppinion its more difficult and time consuming to get the light out of pocket, than to unlock the tailcap, so the locking feature is (for me) really great thing and not a problem.
If i go at night with dog around the town i take the lanyard strap around my neck, and sometimes the really great holster.