> How should battery life be indicated?
On depend would be my choice to minimize drain and to avoid extra display hardware. My suggestion would be that on power up of the circuity it would pulse (maybe 2.5 lumens) a number of times to indicate how much power there is. Say 1 flash for every 25% of estimated power, so a fresh battery would give 4 quick flashes. So if someone wanted to know how state of batteries they would just just unscrew the battery cap until contact is broken and that tighten. The flash light would strobe, and the user would know the state of the batteries.
> Whichever, it would greatly complicate the control circuit tremendously.
Indeed which is why I think it's a a nice to have, rather than a core requirement for the light I use.