Don’t copy this — even Wang Duoyu wouldn’t fund it

Tool recommendation

Why does a 48V e-bike Li-ion battery have such short range?

Handheld portable spot welder, adjustable heat, swappable tips

Cells dead after two years without charging — repairing a Xiluopu scooter Li-ion battery

Compact smart spot welder with a colour screen for adjusting weld mode and strength — makes repairing and DIY-building battery packs really easy

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

Re-celling a 48V Li-ion battery

Building a 48V e-bike battery from 78 × 18650 cells

First-person immersive look at a day of repair work

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

A first-person, immersive look at a day of repair work

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

Welder at gear 60, welding 0.05 copper + 0.12 nickel-plated steel strip — the results

Never serve low-end customers — deep down they don’t recognise your value

Appliance repair ep. 260: vacuum cleaner battery replacement

A programmer goes home and fixes appliances for the old folks? I’m an embedded automation full-stack developer, and I repair appliances for the elderly in my hometown

Appliance repair ep. 259: replacing a vacuum cleaner battery

Building a 24V Li-ion battery from 16 × 32140 cells

AWithZ spot welder gears 1–5, weld quality test

Appliance repair ep. 258: Xiaomi car washer battery replacement

First-person, immersive — how to fix a speaker that won’t turn on

Stair-climber lithium battery doesn’t last — rebuilding it as a higher-capacity pack

Episode 183 | When you want nothing and nothing matters, what do you do? Keep sinking, or look for something that makes you happy and try to cheer up! Life is just an experience — make sure you enjoy it

A follower asked whether the AWithZ UF20B can weld copper stacked directly; I said probably not, he said support says it can with flux. Fine — if you don’t believe me, don’t ask me again, the video is right here, see for yourself. The welder is the AWithZ UF20B from my showcase, upgraded No. 6 welding pen: copper straight on vs copper on a nickel base. Also found some followers haven’t even figured out nickel base layers… mainly I turned the power bank into a 30000mAh one, and it’s a joy

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

Building a 21700 pack with AWithZ — full workflow

Got it now? Building a 21700 Li-ion pack with an AWithZ welder