DIY high-power flashlight tutorial: three 18650 cells and an e-bike headlight for under ¥20

Universal magnetic base build guide — the step-by-step build guide for the universal magnetic base is here

A primary-school kid builds a 20,000mAh power bank — a 20,000mAh high-capacity, fully transparent cyberpunk-style one for a neighbor

7.4V glue-stick mini fan tutorial, adjustable speed

DIY flashlight — 3×18650 + e-bike LED, under ¥20

Spent ¥127 on a high-power flashlight that lights up a whole building — no more fear of walking at night; 15 cells give 12 hours of runtime

DIY an ultra-long-runtime seven-color night light? For the last science maker class of the term, I hand-built an ultra-long-runtime seven-color night light as a gift for my students

Universal magnetic base — step-by-step

Trash to treasure? Making my own solder-fume extractor! The perfect weld

Ep. 61 | Last time a friend asked for one made from 18650s — today we build it; the full build is in the video, please watch patiently

Build your own portable knife-sharpening gadget that every home needs? Kitchen knife gone blunt? Build a portable belt grinder on the cheap and never worry about a dull knife again

Modding an iPhone battery to 20,000mAh — a week of runtime

No more slow phone charging — for under ¥100 I built a 100W flash-charge power bank that supports multiple fast-charge protocols

Homemade jump starter: a DIY car emergency power supply, turning a bought Bluetooth-speaker shell into a car jump-start pack

Homemade jump starter, DIY car emergency power — turning a bought Bluetooth speaker shell into a car jump pack

A home-made jump starter from 18650 cells — only 2C cells, picked up for ¥20-odd on the Douyin store; DIY car emergency power, built into a bought Bluetooth-speaker shell

Found a new trick for the AWithZ spot welder, haha: spot-welding light bulbs

Anyone else burned by a power bank? I went for a battery spot welder — power-bank freedom! Totally hooked

The batteries I planted are ripe — picking a few to make a power bank