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I still have two Petzl Zooms, which I always liked to use. Has anyone tried using the headlamp with a FR0500 6v bulb and a 6v battery pack of some kind? The 3 AAA 4.5v option still works, but at greatly diminished capacity as compared to the old Duracell flat alkaline. Alternatively, has anyone tried assembling a pack of four of the higher-capacity 1.2v cells? I don't know how well the stock 4.5v bulb would tolerate 4.8v. (I know there are several LED mods out there, but I'm curious about what good options there may be for keeping the halogen bulbs.)

Thanks.