Not a runtime test, but some calculations are mentioned in my review: "The KD XM-L U2 3-18V drop-in takes about 0.5A from 4 x 18650, allowing something like up to five hours runtime on high."
Not a runtime test, but some calculations are mentioned in my review: "The KD XM-L U2 3-18V drop-in takes about 0.5A from 4 x 18650, allowing something like up to five hours runtime on high."