Can't fix it, but I'll build it — POV hand-made pack

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

Repairing a Philips shaver with a new battery so it lasts another 10 years. After years of use it died a few minutes after charging; now with a higher-capacity cell it runs twice as long as new

Spot-welding power-bank cells with the AWithZ portable welder. Spot-welding power-bank cells with the AWithZ portable welder. After long use a power bank's capacity drops. A shame to throw it away; swap in a few high-capacity cells and it works again

Appliance repair ep. 258: Xiaomi car washer battery replacement

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

No flashlight repair today — replacing the 18650s inside a Milwaukee 12V battery

Building a 12V off-grid pack from 18650

Swapping a flashlight battery with a handheld mini Li-ion spot welder. The handheld mini welder is easy to carry and works for re-celling power banks, players and other small gadgets. Solder a Li-ion cell with an iron and the heat raises the pressure inside and can ruin the cell — only a spot welder will do