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

I built a ‘New Year atmosphere machine’? If your village had a voice-controlled remote firecracker toy like this, would you stay home a few more days over the New Year

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

Ep. 66 | How to hand-build a portable desktop mini drill press? Build a DIY maker's own desktop drill press that can even drill into rebar

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

Second version of my low-cost DIY soldering iron: upgraded to Li-ion power plus a printed shell, more convenient to use

Universal magnetic base — step-by-step

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

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

Building a lithium-powered electronic magnifier to hunt for gold inside chips

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