Petzl Myo Belt 3 Headlamp:
If the added weight of headlamp batteries is a constant pain in the neck, consider the comfort and convenience of pocketing your battery pack. Petzl's Myo Belt 3 features a 100-meter range Xenon halogen headlamp and three energy-saving LED bulbs, so you can choose between night-penetrating power and tent-friendly practicality. It's a comfortable option for climbing, camping, cycling, spelunking and adventure racing. You can also optimize battery life in cold weather by keeping the power pack inside your insulated jacket. If power does run down, the electronic system automatically switches to energy-saving reserve power mode for proximity applications.