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

7.4V glue-stick mini fan tutorial, adjustable speed

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

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

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

Building a car jump starter from supercapacitors + lithium cells — the cells store energy, the supercapacitors deliver the big current; 21700 4000mAh cells in 2P4S, 2.7V 360F supercapacitors, two together should push past 100A instantaneous, CCA estimated 500+, should start a 2.4L car; final assembly and test next

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

Hand-built monster fan

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

Ep. 31 | Very ‘open for business’, good morning, a workhorse’s daily grind, energy +1 — hand-building a 2S2P flashlight pack for the Wurkkos SP10 and other 8.4V flashlights

Ultra-low-voltage coilgun: the most powerful coilgun with the least copper

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