There are quite a few 1x21700[1] flashlights and most of them have memory and/or shortcut based UIs. Any other preferences? More flood (wider beam) or throw (longer range)? USB powerbank function? Better color rendering? Sideswitch? Tailswitch? Magnetic tailcap?
[1] 21700 is a standardized Li-ion battery size, which Coast calls "ZX1000" for some reason.