Oh! Just one more comment.

I understand the batteries these lights use discharge a constant voltage at all times, all the way up to running out. This means that the light gives out constant power at whatever the charge level. It does not dim as the batteries run out.

Instead, when the battery runs low, the light output drops to medium brightness and the blink pattern changes.

I like that the lumens output remains constant. With some other lights I have the light is brightest with new batteries, but gets dimmer with time. Not so the niteflux.