My nephew and I recently purchased 2 Nitecore E4Ks. His steps down within 2-3 seconds from turbo or high.
Anyone else experienced this issue? [emoji363]
Welcome to CPF. What cell is he using? How long does yours last on turbo or high? Are you located near him to side-by-side to compare? Has he tried using other cells? Are the cells charged up all the way? Is the tail cap screwed down tight?