Repair Makita BL1830 Battery By Making One Good From Two Bad 

This battery reconditioning program exceeded my presumptions. It worked on any drill battery, several AA and AAA batteries batery.repair and any camera battery. The steps are simple and the act itself is exciting to do. No matter what type of battery you`ve got, it is sure to function again!

You are one of the few who have shown how to test each cell, soldered the batteries back in place and shown when the circuit protection board need replacement as well. Many thanks for a very well explained video and the links for parts.

Thank you for the valuable information. Good thing I checked before recycling two of mine that just went bad after 6 years. I think these are the same cells I use in a vape. Now I have two paths I could take :-) Great video, well done and thank you again for your time and efforts.

You do such a neat job removing and resoldering back those battery...

Just did this mod to a water damaged battery, works perfectly!

Good video U make it look so simple!

Great video. Thanks for taking the time to walk us through.

One of the best and knowledgeable videos on 18650 li-ion battery repairs

This is a great video on this repair.I've done about 10 of these battery's now in the last year and a half. Alot of them seem to fail again. Ether the replaced cells go out or they create the next weakest set and those will go out. I put them all in balanced when I do them. Its to bad the replacement (board chip pcb) doesn't balance all the cells on each charge. If one set drops a little lower it boosts the others up. Eventually when it gets to low it will cause the replacement board to fault (flashing lights). But on the bright side you can change the bad low week cells again or separately charge them and it will start working again. It Doesn't lock you out. I think the best way to charge the mixed matched used cells would be to use a balance charger to keep them equally charged. Sometimes the battery's show its fully charged on Makita charger but is still weak when being used with a tool.I have taken it apart again and one set of cells is weaker. The Boards i have been using were from different supplier look the same but the temp sensor is longer. Sorry for the long post.

Thank you if only l'd have the gear and time ,good vid mate ,and nice work , Cheers.

Excellent advice... really good source for fixing my dead bosch cells... thanks a lot!!!

Good video all round. I do wonder if you could have checked the internal resistance of the two "good" replacement cells. One of the cells in the final test had higher than average internal resistance (and thus had lower voltage) and it may be that one of the batteries you installed. Testing the donor batteries before they get soldered in is doing due diligence. I learned a lot from your instructions and I thank you for time and effort, much appreciated.

Awesome video, thanks for sharing. Can you tell me what supply voltage you are using for the imax please?

I have a working Makita battery which the yellow tab on the circuit protect board has broken off. Would I be able to buy a new circuit board and just swap the whole piece out?

Great video.... Question: Could the charger you linked to be used to charge 12V motorcycle and car lead acid and also could it be used to charge a motorcycle Li-Ion battery with more than six cells (no idea how many cells they have) ?? Thank you

awesome video man. Any idea where one could look for broken used batteries?

thanks a lot for video. im also interested in this batteries, and have done some repairs, but i only used imax charger. im suprised that there is the circuit available on market to make complete repair (original charging with original charger). I noticed that with your imax you are charging cells as LiPO. I think that these cells are LiIon and should be charged with Imax with LiIon setting. Also I think that max voltage for them is 4.1V and not 4.2V as shown in video, correct me if Im wrong.

hello! Very good video about reparing makita batteries! thancks a lot! I started to fix one of my batteries also but i have a little probleme. I soldered the new Protection board like you and also a Balance wire 5S for balanced the batteries for 1 time. It is very strange because my charger see only 4 groups of cells when i try to balance them and i have cheched the connection and everything is ok. Do you know from your experience where could be the problem? Thanck a lot for your answer!!

Thank you. Liked and subscribed.

You have to watch out because there are similar Makita batteries which have charging cycles logger. I heard that there is a easy way to bypass the counter or reset them but I forgot how to do it...that's why I run my Makita battery pack with an Amazon BMS and XT60 connector in the drill and battery

Nice job very clean repairs! I was wondering if you have ever thought of tackling the project of taking the shell of a Makita battery and putting the required electronic converters in it to power of Makita tools with a cord? There is a product for sale made by Green Lee electrical tools. It was made to power one of their crimpers for large cables I believe. It is made with a Makita drill as a base platform the batteries capacity must not have been sufficient for their demands of their tool so they have made such a product to support of their tools needs! I could just buy one, but I think that it would be a fun project and I would hope a guy could do it for much cheaper than the $285 USD That they are asking for them! I am quite vested in the Makita 18v and 18v X2 tools. It might be due to my poor searching skills on the internet as well of lack of knowledge in electronic components but so far I have had of no luck finding of what they could be using that would fit on the inside of the battery shell. If you think that there is value in such a project I’d love to see a video of your quality of such a project or possibly feed back as to what they may be using to convert the 110 power to the 18v tools most efficiently in such a small space! Thanks if you do and I look forward to more batterie videos again, nice job! I think your videos are easy to understand and will help many diy’ers complete their own repairs! Cheers, Rod

Good job thank you

FYI to remove Makita Bl1830 battery screws use a Torx T10 security bit (it has a hole in torx bit center).

I've charged each pair of cells after replacement, and the makita charger accepted the battery with old circuit again ! :)

I have some non-working batteries, now I know what to do with them. Thanks for the video. Where to buy such an lcd digital multimeter?

If you replaced all the batteries without putting a new board on do you think it would have worked?

The replacement circuit board is not compatible with balance circuit? So this means that to charge properly, you can only do with a separate balance connections and universal smart charger? Is there a replacement circuit that is compatible with makita charger and balancer???

Given that the Makita balance board will not let you replace cells and the replacement chinese boards do not monitor individual cells so cannot balance the battery, I feel the only viable way forward is to connect to individual cells with one of the connectors used in the R/C world and then use something like an Imax B6 to re-charge and maintain balance on the battery.

Спасибо друг, выручил !👍

Good job.

If your Mikita balance board doesn't like the charger it could be over voltage (Mikita only charges the cells to 4.0v) or it could have tripped the failed try counter. There are several versions of the Mikita battery balance board on eBay, you installed the old circuit board that only removes the battery from the load when the #1 cell gets lower than 3.2v, on a new pack that previously had cell balancing. I took apart 8 packs and made 5 working packs. I've got some new design balance boards on order for my older (junk pile) pack that now has a failed board and some mismatched laptop cells.

Good video

Hello there. Can we operate the Makita ddf482 model cordless drill directly with dc 18-20 v without battery?

Thanks

What kind of soldering iron do you use, I mean how many watts? Great content, thank you.

Please try using flux for soldering lithium battery

Is it not possible to reset the original protection circuit board? perhaps if the voltage was completely disconnected from it for a while, so it cleared the memory?

There is a Chinese company called LLC electronics, they offer a set to make a Makita LXT battery, you get a case, the cell holder, prefabricated nickel strips and a PCB with balancing. With this there's no need to use a 3rd party charger for balancing, it is done by the Makita charger automatically.

Good video. But I dont use Sony 18650. They are too hot when power load and make battery stop working by heat sensor. Samsung, Panasonic, Sanyo are better.

Does anyone know what the two small holes (with metal inside) on the Makita power source terminal are? I understand the two metal contacts (+, -) but I don't understand the two tiny metal contacts. My 5.0amp 18v battery doesn't have any visible contact ports that match. Maybe that weird little white box/white wire on the left at 4:40 has something to do with it? Is there any wireless connectivity going on? I ask this because the power source terminals from Japan and the U.S. have a very slight difference. If those extra metal pin holes are inactive, it seems like the US battery should work with a Japanese terminal.

Do you know if i can use one of those pcb to convert a nicad drill to li ion? Only by changing the conection of the pcb to drill is a craftsman 15,6v and i want to change to li ion but charging with same charger

very good

I just soldered the circuit boards from Bangood onto my repaired packs and the charger lights up red like it is charging for about 5 seconds, then flashes green a few times and then red and green like the battery is broken. Why are these circuit boards not allowing the pack to charge? Thanks for you help.

Thanks....

Hello. Please, That yellow connector on the battery is what? What is it used for? Can the battery be charged only by connecting to + pole and pole -? Thank you, Bob

Can you buy these cells to rebuild a old pack and what about the stupid chip? Is their a way to reset the chip to 0? Will replacing the board make a battery with bad cells chargeable?

Hey, Does anyone know a source for the yellow connector on the batteries? Those POS are NOT suited for placement in a rough-and-tumble toolbag. They break easy. I need to replace them to fix my batteries. Thanks

Hi pliz ryobi hardwire reparing burshless drill

What type of screwdriver did you use?? It is not a phllip driver screw on mine? can I buy that from somewhere?

rất hay , nhưng có cách nào reset cái mạch cũ lại được không bạn

Companies normally dont want you repairing things, increase in profit margin to say nope non repairable. When realistically its the cells that fail why not make a pack that has easily replaceable cells such as somthing like a AA battery toy where you pop off a side panel and swap the bad cell with a new one. Still have to buy the specific 18650 either high or low discharge based off the amp hours of the pack. (Low amp hour packs the cheap ones that normally come with the drill in the first place normally use high discharge (about 15 amps per cell with maybe 5 or 6 cells, low life expectancy given the output) A 4 amp hour pack might have 12 cells and draws maybe 5 amps per cell which is akin to ypur laptop batteries, overall higher capacity but low discharge but when you stack 12 together you get the same amperage as the smaller high discharge packs.) Larger pack might be 3 times the cost of a amall one but its technically 6 times better as the individual packs of cells will balance charge (3 sets of 4 for example) they dont have to output so much power (5 amps over maybe 1t amps) so they will have a higher capacity, and given the lower individual cell output the battery itself will last longer without crapping put

Saya tidak mengerti masalah batere, mau tanya apakah batere makita 1860 bisa dipakai ke masin yg baterenya makita 1830 ?

Hey, thanks for posting this. I had the red/green flashing lights and replaced the board as you did. All seemed ok at the first, but in the Makita charger it only charges for around 20 seconds before the green LED starts flashing and charging strops. If I remove the battery or unplug the power and plug it back in, it again charges 20 seconds before flashing green LED. Any idea what may be causing this and how to fix it?

Круто, наконец кто-то разобрал ориг аккум макита. Есть вопрос: какого номтнала на плате стоит пред? Ведь он там есть? Спасибо! Честно говоря, от увиденного усилилась вера в комплекты с алика)) они практически ничем не отличаются, всё, что нужно- либо аккуратно припаять, либо замутить приемлимого функционала точечную сварку. У меня, правда, с первого раза не получилось, я, похоже купил банки не очень высокотоковые... Собрал в корпусе на 5 банок реальную ёмкость 3400-3600, шурики крутят на ура, а перф крутит 3-4 секунды и отрубается, не хватает тяги. Сейчас думаю попробовать собрать на шоколадках HG2, чуть меньше ёмкость, но они отдают хороший ток. Кстати, на плате с алика пред 15А, и по поводу этого есть сомнения будет ли достаточно его для работы, например болгарки...?

good wording

I changed out the board and the battery drains continously what could case this

If the protection circuit is inside the battery pack , then why the need for that yellow connector which has 7 lines which plug into the charger?

whats the solder wire you use

Did you realised that cirquit boards have different contacts. Looks like one battery is with star, second without. Middle connector at one have two contacts, and second battery Middle connector only one contact. My impact driver does not work with battery with two contacts. Work only if battery fitted not fully. So battery will start charging after this, but tool may stay without battery if it need two contacts instead of one

I m wrong or when you soldering the new circuit is not the case of battery the same?

The balancing wire cannot be connected to the yellow terminal on the battery?

Can someone tell me for what Is the yelow part for on the board?

You linked to a fake iMax B6 charger. Someone asked if they have the holographic authenticity sticker and the supplier said no. That means they are fake.

Are those sony vtc3?

3:23 Hi Well Done Tips. Why do you use LiPo Charge Instead of LiIon?

Because I am not technically minded, I missed the exact detail why the original circuit was replaced - ie what was it that the original circuit refused to do?

what function is little red wire on board

How do you open the battery BL1815 18v

Which watt of soldering you are using?What trick to solder it 18650 battery?

What tx10 security driver is that?

Have done this on a 14v battery about a year ago. The original makita charger only charged it twice and then it died again. New is best.

thanks now i know whats inside the battery pack, just 10pcs of 18650 batteries.

do you ever use these batts ?

Can I buy two BL1813G batteries you made? This is south korea

Great video but Im a busy contractor I dont have time for these repairs. My question is why do so many of mine fail? Its at the point where Im considering switching brands. My tools are not abused. (aside from one battery that happened to fall into a hot-tub.)

after replacing two cell , how much voltage battery is ?.if you charge . does battery recognize original charger?or having to charge in balance

These 2 batteries are original?

I suggest you create and sell an adapter that can plug the battery operated tool into electricity when the battery is finished and market it world wide so you can become millionaire

Doing this is actually quite dangerous. Following this process actually bypasses the inbuilt safety protection. Battery manufacturers know very well what these batteries are capable of when modified and thus users can't reset these boards. I've seen what one of these "repaired" batteries can do in a vehicle. Lets say there was not much of the vehicle left. This happened underground, and those of you who have worked in UG mining know what a vehicle fire means in that environment. Oh, and you can forget trying to claim insurance on damage caused by tampered batteries.

i have one 3.0mAh battery fully working. how should i proceed in order to make it a 4 or 6.0mah?

super

What screwdriver bit is required to take the battery apart?

Hi ! Because... You used the tools , for doing driving jobs , and let's the driver 's cooling down 's ! Will be long 's workable battery's life 's !!!( heat will killed life's of battery

Can you write the size of the batteries you use, the voltage and the mah?

I was going to buy this balance charger but it says it's for 1-6 cells. Here you are charging 10 cells 3:28 Is it ok to do that? Edit: ok it counts as 5 cells since it’s 2x5.

I am having trouble duplicating your instructions. The iMax B6AC V2 keeps saying "balance connect error" and will not proceed. I put it on a good battery and the same result. Can you help?

Worlds smallest yet most powerful soldering iron.

so.. question, those replacement board dont connect to every singel cell, how is the pack balanced?????? that's whats keeping me from buying those boards and im very suspicious about their capabilities

I have the smaller type just won't charge

the top of that battery looks like the inside of my pants when i visit a slaughterhouse

i built mine with new vtc6, feel free to watch

i've always wondered. is there any risk of getting a electrick shock from the batteries when doing this operation (unless you purposely short it)

Please don't solder onto Li-Ion - use a spot welder.

Finally someone using brain and charge it with balancing. There is tons of videos showing people using those fake dangerous bms boards + old cells with different voltages and using it with oryginal charger. They shouldnt make videos if they dont know what they are doing, because that thing can burn someones house.

4:46 Looks like the replacement Battery Protection circuit has no balance? That is annoying.

This is Mikitas OG line

As the chances of getting a hard short using a metal knife you should tear up on safty

Did 10 x 3.7v = 37v?? How its labelled by 18v??

bad ass

These circuit boards are discontinued.