How long do they last on a full charge? Depends on how many lights are run from it, but let's say it's just 1 Gantom One. 6000 mAh / (400 mAh draw from Gantom One) x .7 (to factor in battery factors) = ~ 10.5 hours 1 Precision Z's draw 125 mAh. (6000 mAh / 125 x .7) = ~ 33 hours. *Know that these are estimates. For use with Gantom products.
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