I carry this in my EDC now
https://www.surefire.com/illumination/flashlights/sidekick.htmlI top it off after use or once a week.
I just got this one for a headlamp/bike light.
https://princetontec.com/product/snap/I used to standardize on AA but am moving to AAA for the smaller size/weight. With the modern LED's the smaller AAA battery powered lights can still provide plenty of light and runtime.