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This Milwaukee M18 18v 5ah battery won't charge or power a tool and is showing only 13v on the multimeter. So I took it apart and found one bank of cells to be defective I replaced the offending cells and still it wouldn't work even though the voltage was within the chargeable range I ended up replacing the pcb board with a knock off one from ebay this got the battery working and charging again.
If you are interested in the items used to repair the battery links are below
Milwaukee M12 Soldering iron
UK amzn.to/3UcOsdy
USA amzn.to/3MmXJxx
Venlab Digital Multimeter
UK amzn.to/3KDi805
USA amzn.to/3MlEep8
Spot Welder
UK amzn.to/3mfPXLi
USA amzn.to/3nOlCEa
Milliontronic Security bit set
UK amzn.to/3Kj7N87
USA amzn.to/3UdIRnk
disclaimer
battery repair is a risky undertaking and careful consideration should be taken before attempting it
it is not the intention of Doctor Lefthandthread media for any injury to occur as a result of my videos
this video is for entertainment and educational purposes only