Milwaukee M18 4Ah Battery repair

We take a look at a faulty Milwaukee M18 4ah red lithium battery and see how to repair it. We'll start by testing the voltage of the battery, which is suboptimal at only 14.5v. We'll then remove the casing and test individual cells, finding two of them are faulty. Using donor cells from a Dewalt Flexvolt battery( both the Milwaukee 4ah and the 6ah flexvolt use similar 18650 cells 18650 cells with 2000mah lithium ion cells), we replace the faulty cells and test the voltage and charging of the Milwaukee battery. The other sizes of flexvolt 9ah and 12ah will not be compatible as they contain 21700 lithium ion cells which physically larger and have higher outputs. The cell replacement of the 2 donor 18650 from the flexvolt dewalt 6ah was effective however the battery also required a pcb board replacement which can be ordered on ebay. The fix was truly effective with the new pcb and a full bank of viable 18650 cells the battery took a full charge and is in working order. The cells used are inr18650 samsung cells. This fix will work on 5ah 4ah batteries although 5ah batteries have 2500mah cells instead of 2000mah. Battery repair is a risky undertaking and should not be done without careful consideration. It is not the intention of Doctor Lefthandthread media for any injury to occur as a result of my videos. These videos are for entertainment and educational purposes only.
Can a milwaukee battery be fixed?
how to fix a milwaukee battery?
this video answers those questions and more
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

[@doctorlefthandthread]

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

[@killersidewinder]

Awesome. I feel confident I can now fix the 4 faulty batteries I have bloody. milwaukee are expensive to replace

[@doctorlefthandthread]

Great to hear good luck

[@JakeReid-o3m]

Great informative video, I have been struggling with what to do about all these batteries, most are all Milwaukee, but i have others as well i just put in a box. Can you tell me where I can start to search for the circuit boards to make these repairs. And here is a question, once I found these circuit boards, check everything and make the repairs, do you think there is an upgraded board that will fit that can up the juice on these 18V?

[@doctorlefthandthread]

The board will never up the juice the cells are where the power comes from you should be able to source boards from ebay if you need a link let me know

[@JakeReid-o3m]

Thank you very much, if you have a link and it is easy to share that would be greatly appreciated. @@doctorlefthandthread

[@doctorlefthandthread]

It will take a while for delivery but www.ebay.co.uk/itm/394818871656?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=q4o6nionq0e&sssrc=4429486&ssuid=cjPn_ZfdQLW&var=&widget_ver=artemis&media=COPY

[@fmolland]

Hi, just looked at the spot welder you linked to here, they dont look the same? Are you happy with this One?

[@doctorlefthandthread]

Yes they are basically the same

[@fmolland]

Ok 👌 the one I have now cannot spot weld to the original metal on m18 battery, no problem to a 18650 Cell. Do you know why?

[@doctorlefthandthread]

@@fmolland the one I have wouldn't either you have to use fine strip

[@fmolland]

Do you know where to get pure nickel strips? Many on eBay say that they have 😀

[@doctorlefthandthread]

@@fmolland www.ebay.co.uk/itm/274865824817?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=k6L2r3Z0R46&sssrc=4429486&ssuid=cjPn_ZfdQLW&var=&widget_ver=artemis&media=COPY

[@aaronmccool922]

Need a few bits fixed Milwaukee grinder combi drill and rip saw I’m in Armagh but be all over the north

[@doctorlefthandthread]

Are you on WhatsApp? If so email your phone number and I will ring you [e-mail]

[@aaronmccool922]

Sent email with number there

[@doctorlefthandthread]

@@aaronmccool922 haven't got it yet but I will give it a while here

[@doctorlefthandthread]

No sign of it try it again [e-mail]

[@doctorlefthandthread]

I have never received the email.