How to Repair faulty Makita Battery.

This video about how i fixed my faulty Makita Battery.

[@user-pz6cx8zf2y]

The thermistor should be touching a (pilot sensing) cell of the assembly for its proper protection against over-temperature. As shown in the video, it stands on the plastic case of the assembly, which means that if this protection will ever work, it will be too late... Furthermore i don't know if the cell balancing during charging will work, as the four sensing cables are missing from the new pcb. Along with all of these things, it seems that the overcurrent protection of the drill motor is also missing from the new pcb, as the shunt resistors shown on the old pcb are missing too...Therefore, at least in terms of safety alone, this repair seems to be both poor and dangerous...

[@scottbaker9066]

Do the newer balancing circuit boards fit onto the old battery holder and under the older plastic top lid? that was produced with the older little not balancing circuit board ???

[@josephsaucedo8691]

You even try to soldier it off just cut it off with wire cutters it's trash save you a lot of time and some times the screw location wrong hot glue it and make sure you can close the case👌👍💯✌️🎄🎆

[@Popajaja]

Unlike Makita, Hikoki and Bosch Li-Ion batteries, Milwaukee batteries can be unlocked. The intelligent Milwaukee charger, after checking all Li-Ion cells, reactivates the battery's electronics. Yesterday I received 5 pieces of "defective" Milwaukee M18/5Ah batteries for free. After two hours, all batteries work like new without changing cells, BMS and soldering iron!

[@TheEhssan0]

I have BL1840B ans PCB board is not working and the battery two by two blinking , I checked the market there is no any board for my modle but 1830 and 1850 is available, you think that we can use it???

[@wandeethosuanchit3833]

บอร์ด ที่นำไปเปลี่ยนใหม่ ใช้เบอร์หรือรุ่นอะไรครับ

[@ezechielhenoch2737]

Where did you buy the PCB board PY-BL1860B / BL14 ???

[@chiphill4856]

What is this? 30mins of someone using a screwdriver?

[@bnbpartin3100]

What bit did you use

[@lotesla80]

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

[@kishoreseeruttun6045]

I have a 24v battery how to repair it

[@spinal_by]

There's no balancing function in the PCB you installed. The individual cells can be overcharged/overdischarged. It can be dangerous.

[@myshitonyoutube]

How can you see that? I don't doubt you but isn't it the contacts in the yellow part that are the balancing contacts?

[@ciprianwinerElectronicManiac]

@@myshitonyoutube Nope they are not, for a pcb to have balancing it needs wires going to each cell and transistor and resistors to balance the cell, as for protection there needs to be at least a big power mosfet which it is also missing on that pcb.

[@myshitonyoutube]

@@ciprianwinerElectronicManiac thanks for explaining.

[@vsvnrg3263]

quite right! however, not all my genuine makitas are balance charged. and more than 10 years old too. the newer ones are.

[@obie224]

as long as you're replacing all the cells at once with known good balanced cells, it's not a big deal. older makita batteries don't have balance charging either (i have some of these) and they just work, in my case for over 8 years. if you're mixing and matching cells though, get a replacement board with actual balance charging.

[@dennishoane6808]

het is wachten op brand

[@truescotsman4103]

without the protection circuit in the original board this battery can explode and burn down your house. do you think this repair is worth that much trouble?

[@chanharis6059]

Before you write a comment read a instructions of the circuit board mate. It’s a built in protection. Do you know about electronics ?

[@truescotsman4103]

@@chanharis6059 the original board failed due to an error or defect in the batteries. The new board is going to overlook the error or defect that the original board failed for. Do you understand electronics? Do you understand batteries can explode and cause a fire and burn down your house? Do you understand there's a reason they put a battery protection circuit on that battery? Give me a break

[@chanharis6059]

@@truescotsman4103 , I’m not going to tell you anything, I’m an electronic engineer. Now you can have a proper break.

[@truescotsman4103]

@@chanharis6059 you're an engineer and you fix batteries? Can't you find a real job?

[@chanharis6059]

@@truescotsman4103 ,don’t comment anything you don’t know. That’s shows how smart you are.

[@Ronick-Q-46]

Where's the proof that it works on a tool, if I'd done a repair I would show a tool working with it. the video to me means nothing.

[@kolrobi]

This isn`t a repair, if there is a fault with the cells the PCB board won`t let you charge it for safety reason. Replacing the PCB board does not solve your problem, you just made a ticking timebomb.

[@TheEhssan0]

I couldn't find PCB board for BL1840B, do you know where can I find it?

[@kolrobi]

@@TheEhssan0 these are universal you can use them on any however later ones and higher amp come with a more advanced PCB (bigger one, not the smaller like in your video)

[@TheEhssan0]

@@kolrobi thanks for your reply, can you share the link which you bought

[@TheEhssan0]

@@kolrobi bcz my PCB is bigger than yours , I doubt that one works on mine

[@obie224]

idiot.