Makita 18v battery management board What you need to know, faulty makita battery repair

[@FINDITFIXITRESTOREITBUILDIT]

Makita tool restoration and repair videos: kzbin.info/aero/PLtA1NnZlTsl68KJnD1G__p1rnMFInEZC5

[@zaiuszaius7308]

Can you just replace the yellow connector block, it’s snapped off

[@MADMODS]

@@zaiuszaius7308 no you have to replace the board unless you are very skilled with a soldering iron. I have replaced a few due to the same issue.

[@marceldaniel673]

Bring on the batteries repair videos , proper hands on. 👍

[@FINDITFIXITRESTOREITBUILDIT]

got about 20 to look at and try to fix got a to build a battery spot welder this weekend for them will be doing a video on that then the repairs can get underway.

[@nerminm3249]

No one knows enough about these batteries, I think Makita does a pretty good job of hiding the secret about how their BMS (Battery Management System works. That being said the u-tuber here is right when he said it doesn't make much sense buying one on ebay or elsewhere because it might not fit the case or it might not work at all. But what he doesn't mention is that someones the cells are perfectly balanced and nothing is wrong with the cells at all but it still won't charge and in my opinion the BMS is faulty and at this point it is perfectly fine to find alternative ways of changing and using these batteries. I for example don't care about their BMSes ones they go bad. I make it work my own way and charge it my own way, have yet to have any issues with it. Makita uses very good cell but I don't like their BMS!

[@mariusz1977]

Hello, the BMS battery board does not remember anything, it just informs about the error by blinking the diodes, the locking process is performed by the charger

[@tombowman4489]

This is exactly the subject matter i was looking for! Thanks for a great video! I'm charging each cell of a Wheatley 6ah pack that has gone dead in hope that when they are all charged to the same voltage the Makita charger will charge the pack again... So far I'm at 3.43v - 3.7v. trying to get them all up to the 3.7v mark. When I started 4 if the cells where reading a 0 voltage. But they all seem to be holding a charge now. The pack indicator is now saying 60%. Is this attempt likely to work or am i wasting my time? Meany thanks advance 🙏

[@aliancemd]

I guess you answered your own question in 1 month but yes, that should work and Makita charger should be happy again

[@tombowman4489]

@@aliancemd hahaha. Yeah was about a week of charging. But no. The charger was still not happy 😔

[@aliancemd]

​@@tombowman4489 Search on KZbin for "Well Done Tips - Makita 18V Battery Has Big Problem!". Maybe you need to consider using a balancing device - that video should help with some ideas to consider, to solve your problem.

[@mohammadshabirshabir4039]

If I sent you my old dead battery. Will you repair it for me and how much will it cost me please .thanks

[@aliancemd]

Those eBay boards look very basic. I ordered some from AliExpress that have 4V/8V/12V/16V voltage sensing and 2 65C thermal switches - there are options out there to build Makita batteries better than Makita for way cheaper. Got some inspiration from Bosch batteries(which seem to be built significantly better than all the other manufacturers) and going to connect these with 0.1mm copper(sandwiched with nickel, because I don’t have the tools - Bosch seems to solder the 0.3mm copper with a laser, creating A Lot of connection points/surface with the battery).

[@techytools5668]

can you explain yellow connector in makita battery. and purpose of it. can we use this to charge battery with diffrent matheds and ballacne cell?

[@FINDITFIXITRESTOREITBUILDIT]

yes it's connected to the battery management board and talks with the connection on the charger regarding battery state cell state and how many charges the battery has had. it dosnt balance charge through it that's the battery boards job along with the others mentioned.

[@spinnanz]

If the pack hasn't been bricked, can you remove the old cells and replace them without this bricking the BMS?

[@FINDITFIXITRESTOREITBUILDIT]

yes you can along as all the cell voltages are the same. I have done it my self a few times now.

[@spinnanz]

@@FINDITFIXITRESTOREITBUILDIT mint, I'll have to have a crack at repacking then

[@the_tom]

@@FINDITFIXITRESTOREITBUILDIT I could replace them with higher voltage cells (new) as long they are equal voltage. Is this correct?

[@ChrisLivingInYork]

I’ve got a 5amp makita battery up until yesterday was working fine. When I press and hold down the button for the battery indicator light it counts down from 4 bars to 1. Is that a fault which is worth fixing?

[@FINDITFIXITRESTOREITBUILDIT]

could be a dead cell then yes its a easy fix with the right tools. you need a battery spot welder.

[@ChrisLivingInYork]

@@FINDITFIXITRESTOREITBUILDIT thanks I’ll have to invest in one and have a go sometime

[@lex.3333]

Halo! Give me a link to the board please. Thank you!

[@FINDITFIXITRESTOREITBUILDIT]

www.ebay.co.uk/itm/374366443933?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=pq8gZod0R-y&sssrc=4429486&ssuid=lx4qb8FtTp-&var=643272905744&widget_ver=artemis&media=COPY

[@jamesaddisonn1572]

Check fuse with multimeter 2 white blocks next too eachother

[@martinhyska1206]

Do y know if is possible add to makika board 6xlifepo battery? it has 6x3.3v so its around 20v and its similar like lion, but 4xmore life.

[@FINDITFIXITRESTOREITBUILDIT]

it should work in theory.

[@qrsimon]

Pink/red wire is for 7.2v(on 14,4 total), so the other way around. Not sure with 18v though

[@Jonathan-rz8jk]

My yellow bit on a Makita battery is broken can this be replaced ? Thanks

[@FINDITFIXITRESTOREITBUILDIT]

it can be if you are good with a soldering iron, there available on ebay.

[@angelafarrugia974]

I BOUGHT NEW 18650 CELLS AND A NEW BMS ( FROM EBAY). I ASSEMBLED EVERYTHING PROPERLY. WHEN I PUT THE BATTERY PACK ON CHARGE, AFTER ABOUT 20 SECONDS THE CHARGER INDICATES THAT THE BATTERY IS FULLY CHARGED . BUT IT DID NOT. SO WHAT'S THE PROBLEM? THANKS.

[@olivierj.2435]

You have to put 18650 with same voltage on your battery. Maybe you have put 18650 fully charged with 18650 not fully charged so charger will stop quickly as he thinks that your battery is fully charged

[@FINDITFIXITRESTOREITBUILDIT]

it could be a load of issues unfortunately. bad cell/ unbalanced cells / bad bms/ wired incorrectly/ you will need to check everything over with a meter to try and find the fault if you can.

[@daanhendriks7190]

Hi, i have a question. My batteries blink red and do not work. I took them apart and the cells measure 20 volts on the side of the pcb . But When i measure the batterie terminals which connect to the tool i only measure 1.4 volts. What can be the issue?

[@FINDITFIXITRESTOREITBUILDIT]

take the pcb off and check it's not a bad solder joint or melted nickle strip under the pcb. something has a brake in also make sure all the spot welds are on the batteries.

[@daanhendriks7190]

@@FINDITFIXITRESTOREITBUILDIT yeah after i commented i saw your other video, will check the cells later this week

[@mohammadshabirshabir4039]

And where about are you based

[@chiphill4856]

I still can't find a decent video on this subject. Does anyone really know anything about these batteries? Lots of rambling and hand waving but no information.

[@spinnanz]

I'll be doing a video this week hopefully.

[@Stevesbe]

I'm rebuilding to aftermarket makita packs that the cells died in with better cells

[@hendiasmara4175]

Agree with you

[@joemarkey6]

I literally ordered a pub today before I watched this 😭

[@vsvnrg3263]

your bonfire at 1:18, thats a fast charger isnt it? thats probably why it got cooked. genuine battery on a genuine charger. the customers want a fast charger and the competitors make fast chargers so makita makes fast chargers. i saw a video by a repairman who claimed that fast chargers shorten battery life. so i put mine away and only use the slow chargers i got given for free. i never used them because they were slow chargers. who wants slow chargers? i do now.

[@jmvrabel65]

Do you sell batteries

[@FINDITFIXITRESTOREITBUILDIT]

no just buy faulty ones to fix .

[@jmvrabel65]

Can I buy one of the ones you fix

[@FINDITFIXITRESTOREITBUILDIT]

I've got such a large selection of makita tools I use them all. it's just a hobby I love fixing things and don't do that many. I fix tools and batteries along with other electrical items we now just throw away.

[@giuseppetrento1229]

So. Nice ing

[@ВилиамРит]

Hi. Makita battery. How to unlock and restart the BMS board? After a month of operation, the LEDs began to blink and it would not charge. (as in the 10 second video on the link) The BMS board does not work. The battery is original, new. But I opened it myself after it was blocked. There is no longer a guarantee. / The battery pack itself works, everything is fine with the cells. Temporarily soldered a jumper from the short contact group to the adjacent positive contact group, the battery pack works, but in this option there is no protection for the cells kzbin.info/www/bejne/rYCxon2KeNiba6c

[@Nicedesk]

Your burnt/melted battery looks like a knock off brand, not a real Makita battery. Li-ion is dangerous, stick with reputable manufacturers to avoid catastrophic fires.

[@CoSiKo69]

Definitely a scaff

[@abbii1661]

trash talk