I've got a box full of old old old NiteRider lights and batteries. They would wear out & I would just buy a new system. *sigh* Those were the days. I know I can take the batteries to a recycling center (or if you have a better idea, that's great), but is there anything useful I can do with the head units?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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