Are rechargeable or AA/AAA-battery headlamps better?

Rechargeable (USB-C) models are more convenient and cheaper to run day to day, and most picks here are rechargeable. Battery-powered units like the Energizer LED Headlamp PRO have an edge for emergency kits and remote multi-day trips, where you can swap in fresh cells rather than hunt for a charger. Some models, including the Fenix HL18R-T, accept both, which is the most flexible setup.