Need a new brighter headlamp battery system. Lack of bright lamps caused our climbing party to get off route on the descent so many times we spent the whole night getting back to our car.

The 4 of us had all different kinds of lamps, BD, Thrunite, Princeton Tec etc.
What we didn't have was enough changes of batteries to shine a long distance for a long time to avoid being cliffed out. Everyone had plenty of light to see 50 feet or so, but we needed to be able to see a full rope length - 200 ft. for several hours.

Do the li-ion rechargeable batteries have high output longer than others?
regular lithium disposables? Alkaline?