Magicshine clone with an 8 cell pack, and a Magicshine taillight. The whole set runs probably 5 hours on a charge if everything is cranked up all the way. I usually dial back the light to 1/2 power when I'm on paved roads. I really don't know how long it lasts, I just charge it over the weekend.
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Work: the 8 hours that separates bike rides.