I have a Busch-Mueller Ixon light, it runs on 4 AA's for about 5hrs; it has an "emergency" mode, where it tells you when the batts run low and you can switch to a lower power mode. I keep a fast charger at hand, takes 15mins to recharge 4 2500mAh NiMH's. That said, I know the feeling when the light doesn't work.... Anyway, happy commuting!
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