Since you want compactness and longevity, yeap… 21700

Convoy S21A
Convoy M21A
Convoy L21A
You can also get empty hosts and roll your own :slight_smile:
Sofirn’s C8F and C8G are OKAY in my mind, but since I own a few C8F’s, I have grown to despise them as everyday lights to perch about the house… Maybe because they were so front heavy and didn’t fit right in the hand? I dunno
For Everyday Carry, I adore the S21A chassis, is even pretty good with the XHP50.2 6V