Built a flashlight that lights up half the street for under 20 yuan
Three 18650s plus an e-bike headlight, with a water pipe for the housing. Welded the nickel strip with the H1 — tiny little thing, handles 0.12 strip with zero effort.
Switched it on outside at night and the neighbors thought someone had left their car headlights on. Hahahaha.
Pic 2 shows the internal wiring, for anyone who wants to copy my homework.
DIY high-power flashlight tutorial: three 18650 cells and an e-bike headlight for under ¥20ProjectsGoodnight