What batteries work in the Fenix HL18R headlamp?

The Fenix HL18R headlamp is compatible with its included ARB-LP-1300 Li-polymer battery pack. It's also compatible with three AAA Alkaline batteries. Perfect for those who run or walk at night, the HL18R headlamp is extremely compact and very bright, delivering up to 400 lumens. With its multiple brightness levels, simple user interface, and durable design, it's a perfect headlamp to take with you on your adventures. 

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