Mickey, you're right, the 4.5V batteries can be hard to find sometimes. Most people I know who own Petzls have switched to the AA conversion so that they can use recargables if they want, or stop at the local gas station, party store, 7-11, whatever, and get more AA's. Their favortie model so far has been the "Arctic". It has a remote battery pack that you can strap to your waist or across your chest to keep the batteries warm. This also takes the weight of the batteries off your head. These same people I know use it for a helmet light while mountain biking at night, with no battery weight on the headstraps, and rough trails, the light doesn't bounce around as much or cause helmets to knock around as much.
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Don LeHue
Rome did not create a great empire by having meetings...they did it by killing all those who opposed them.