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

Ep. 5 | Tearing down a ¥20 Pinduoduo brushless folding mini fan — incredible value

Ep. 5 | Teardown of a ¥20 Pinduoduo brushless folding mini fan — surprisingly good value

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

You can build a lithium pack at home

The ¥9.9 mini fan I bought last year stopped charging — repaired with one bigger cell, no more runtime anxiety! The same home battery welder as in the video is in my shop window

Beginner’s money-saving guide to hand-building lithium packs

A ¥25 ‘brushless’ handheld car vacuum bought online — opened up, it really is a brushless motor

AWithZ U3 welder — build your own 18650 pack, tutorial

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

DiY

I always looked up to the spot-welding pros, until I got one myself… turns out with full-auto anyone can do it

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

A post by Miduoduo314

Once you’ve mastered hand-building Li-ion packs you’ll never buy a power bank again — all the old power banks at home can be re-celled! Haha

How to build a 12V outdoor-power Li-ion pack from 18650 cells

Diy

[Full reveal] Hand-building a ‘TNT’ C4-style power bank! Do not take it outside

Building a 12V off-grid pack from 18650

DIY tools | A portable spot welder — niche but professional. I’ve been building a solar-lamp project lately and need to weld lithium packs for storage. I’d always used a soldering iron, but soldering lithium cells is slow and a safety risk, so I got a portable spot welder (AWithZ U3) and it works well. Compared with an iron, pulse spot welding avoids cold joints, the nickel strip sits tight, no hot iron is needed so there’s less risk of damaging the cell, and it’s very fast — one weld in 3 seconds, ideal for batch work. Spot welding was new to me, but it really is better suited to battery mods than conventional soldering

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