they are regular batteries. the light is fairly new (which is part of the reason I find the malfunction so annoying). I didn't think of checking the bulb to make sure it's not loose---I'll do that. the pot holes on my commute could swallow my car; so, one of my thoughts was that something is just getting rattled loose. I guess the up-side is that it'll soon be light by the time I leave in the morning and I won't need the headlight at all.



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