This was one of the first headlamps to use the CR123 batteries, which have a great power-to-weight ratio, have a long shelf life, and work better in cold weather. I used this headlamp primarily for adventure racing, where every ounce counts, but at the same time you want as much light as possible for nighttime navigation. The battery compartment is a little difficult to open, but I would rather have it that way instead of a non-watertight casing. Quality construction, bright light, low-weight. Buy the batteries online to save money, you can get them for around $1 apiece. Don't bother with rechargeables unless you only have short trips in mind.
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