So the requirements are:
- 1-4x 18650 cells
- Suitable throw for cycling and camping
- Charges via USB
- Can be used as a USB power bank. 1-2.1A is ok.
- CC/CV charging + cell balancing would be nice.
So far I have found Zerohour XS which is nice but way too expensive for my taste.
Better: SingFire SF-349
Also: SingFire SF-370
I just now also found JKK18 and JKK35 - they look super, anyone with experience and willing to share (also how it would fit my use case)?
EDIT: Headlamps! Found Fenix HP30 but its USB-out only - no charging. I think in this case the lamp should be disconnectable from the battery. Recommendations?
EDIT2: What about this batteryless-USB-powered headlamp Then I would only need to find a more rugged powerbank with 5V 2.1A output and a belt clip