Milwaukee M18 Battery one flashing light won't charge

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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

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Опубликовано:

21 сен 2024

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Комментарии : 50

@clinteastwood8222 4 месяца назад

Thxs for the video very informative. Is this issue with cells normally a Milwaukee issue?

@doctorlefthandthread 4 месяца назад

Lithium battery packs are all prone to this regardless of the brand

@yousefalmarhoon8789 Год назад

Great demonstration for the batteries fix as always, unfortunately I have the same problem with my 12.ah battery it flashes like this, ~& I charged the battery manually up to 4.07V in each pack inside but it still flashes and refuse to work, did you face same problem or not?

@doctorlefthandthread Год назад

When that happens I replace the board but I haven't been able to source boards for the larger batteries yet 8ah and 12ah

@TikkaHorse Год назад

I've had this happen often, and so for (other than one with 3 dead cells) I've been able to solve the issue by unplugging the charger with the battery on it, wait until the light stops flashing (sometimes take a few moments), then plugging the charger back in. Leave the battery on the charger the whole time, make sure it's fully seated, and you have to wait for the light to turn off after unplugging with the battery fully seated. I found this out by chance, and with all but one Christmas light display, this has solved the failure to start charging problem.

@doctorlefthandthread Год назад

@@TikkaHorse that's awesome thanks for the tip

@timwegman5776 2 месяца назад

Wow thank you a million saved me so much time

@EleazarMateozuniga 4 месяца назад

The problem is not the battery, the problem is the battery charger.

@eives44 4 месяца назад

Not always true there is a reason those cells dropped so low it could be the health of the cells struggling to hold the charge hence why they discharged lower than the others meaning yes its still the batteries as I've had packs I've used slow charger on the build them back and they still discharge faster than the other cells and you get a similar issue every time

@joannak7904 11 месяцев назад

hI Very helpful video, please tell me where I can buy such a battery cell welder, or what is it called, what model?

@doctorlefthandthread 11 месяцев назад

Here is a similar one Spot Welder UK amzn.to/3mfPXLi USA amzn.to/3nOlCEa

@joannak7904 11 месяцев назад

Thank you very much. Regards Jan

@timkirby5014 2 месяца назад

What type os soilding gun did u use on the batteries

@doctorlefthandthread 2 месяца назад

M12 Milwaukee soldering iron

@silviu89ket 8 месяцев назад

The Spot Welder that you let it on description is not the same like in your video.can you tell me your model please?😊

@doctorlefthandthread 8 месяцев назад

I bought that one some time ago the one in the link is the closest I can see

@lukedavison11 10 месяцев назад

Northern Irish man myself can I post you my 12amp battery to get the same repair

@doctorlefthandthread 10 месяцев назад

Email me drlefthandthread@gmail.com

@excdalmt7807 7 месяцев назад

What if the light stays green and battery is not charged

@doctorlefthandthread 7 месяцев назад

Could be broken connection bad cells faulty pcb cell imbalance you wouldn't know without opening the battery pack

@excdalmt7807 7 месяцев назад

@doctorlefthandthread its crazy though i have 4) M12 6.0 batteries blink red and green and those are brand new and have 3) M18 12.0 and 1) M18 9.0 that stay green and dont charge and these are almost brand new

@doctorlefthandthread 7 месяцев назад

@@excdalmt7807 did you check the voltage of the battery and the cell individual bank voltage?

@maddawglodbrock1380 8 месяцев назад

I have a battery it has 4 v at each cell and 18 v at the terminals it won’t charge o mr run a drill it will light up a torch do you think it will be the pcb board ?

@doctorlefthandthread 8 месяцев назад

Yes but try this first ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bS5TBVao8ho.html

@maddawglodbrock1380 8 месяцев назад

Thank s tried that it didn’t work will change the pcb. The only thing I didn’t mention is that none of the lights on the battery light up 👍

@maddawglodbrock1380 8 месяцев назад

Still waiting for my new circuit board but I bought another battery today it’s full of water I’m drying it out I’m getting no voltage no light what’s your thoughts is it possible to revive it? Thanks

@doctorlefthandthread 8 месяцев назад

@@maddawglodbrock1380 in my opinion no the water damage always seems to fry the board I did manage to revive the cells in a makita but had to get a new board fitted

@maddawglodbrock1380 8 месяцев назад

Thanks I’ve just stuck another test on the one I’ve a pcb for i was getting 18 v and 4v at each cell now I’m getting 16 v at the terminals and nothing on the cell what would have caused that to change thanks

@maddawglodbrock1380 8 месяцев назад

Do you have a link for who you buy yours pcb boards from on eBay mine was supposed to come from London and came from china poorly packed thank in advance 👍

@doctorlefthandthread 8 месяцев назад

I get them from ebay and they are from China www.ebay.co.uk/itm/235248414701?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ujlvx--aqj2&sssrc=4429486&ssuid=cjPn_ZfdQLW&var=&widget_ver=artemis&media=COPY

@maddawglodbrock1380 8 месяцев назад

Thanks will give it a go👍

@doctorlefthandthread 8 месяцев назад

@@maddawglodbrock1380 good luck

@maddawglodbrock1380 8 месяцев назад

I connected my new pcb the charger does not even flash at all like nothing is connected when I put a jump to it the bbattery terminals they will light up soon I disconnect them there no light any ideas? Thanks

@doctorlefthandthread 8 месяцев назад

Have you tried it on the charger? Are there broken connections? What voltage is coming out of the top?

@maddawglodbrock1380 8 месяцев назад

It’s. Not recognised by the charger and doesn’t flash the charger what so ever. Think it could be a faulty pcb as ther is no continuity between the second from left terminal and second from right

@doctorlefthandthread 8 месяцев назад

@@maddawglodbrock1380 has to be faulty