Reluctantly, I have placed these PrincetonTec Apex headlamps up for sale on Craig’s List today. They are veterans of my coming-of-age adventures with both boys and many solo adventures I have taken over the years. They have seen the bottom of the Actun Tunichil Muknal cave in Belize and the top of Mount Kilimanjaro in Tanzania. They have guided my path through the Patagonia regions of Chile and Argentina, up the slopes of Mount Fuji, and over the Salkantay Pass in Peru. They have never failed me and remain in near-perfect condition. With my upcoming trip to Nepal, however, I am switching from AA batteries to 18650 and CR123A type batteries for all of my equipment. They offer lower weight for the same illumination and longer life. The downside is that the batteries can only be found in specialty retailers.