Posted by: @azzido

Add here any information about Makita batteries.

Hi there! With the power tools battery pinout section now up in the forum is this a sign that we will be able to test and charge the makita batteries??

Posted by: @falcidi

Posted by: @azzido

Add here any information about Makita batteries.

Hi there! With the power tools battery pinout section now up in the forum is this a sign that we will be able to test and charge the makita batteries??

 

Hi there,

After finishing adding all known chips into Reset option we plan to have a loot at Makita batteries. I will inform you.

@azzido This would be awesome. One of the biggest and fprobably most valuable options that would be available to us. Here in Australia to buy a new power tool batteries costs between 300 o 400 dollars each. There would be a huge market to be able to bring back to life older batteries like these. All the contractors would jump at it if I could fix their ole batteries for 1/3 of the price of a new one!

Hello , i have same info about makita battery 18V , i have 2 locked battery the charger wont charge it .

 I am try to find pinout on yellow socket but not lucky , maybe the ic is in the sleep mode , at the monday i try to desoldering the battery and try to find correct pins .

Makita batteries dont use SBS communication like laptop batteries do so they could not be read by NLBA1.

The specification of ML5203 says it has I2C port but it is used to communicate with MCU located on the same Pcb. 

Hi , i found in datasheet  :

There is the following one return condition to the normal mode from the 0V charge disabled mode:

(1) When all the battery cell voltages become normal
When the return delay time passes while all of the battery cell voltages are equal to or more than
the 0V charge disabled detection voltage, the state transitions to the over-discharge release mode.
After that, when all of the battery cell voltages become equal to or more than the over-discharge
release voltage VUVR, the state returns to the normal mode.

Is it possible if i change old cell to new  the controller unlocks by it self ?

You could replace the cells when battery is working using hot-swap method with parallel cells power supply. 

But as soon as chip got Locked, it could not be unlocked by installing good cells. 

There are two chips on the board. ML5202 just a balancing/protection controller, it locks and unlocks depending on cells condition. But another chip could have Permanent Failure flag or Lock bit preventing the battery from charging even good cells are installed. By the way what is marking on that chip? 

On monday i check the marking another chip , before i try to find any info about next chip but nothing to find .

@minde_5 

Forget about this.

These Makita BL series batteries come with  MCU   F0513S - NEC chip (the one in your case)  or  MC908JK3E - FreeScale Semiconductors chip and that is where the PF flags are stored. The PCB is also equipped with a meltable fuse just like a laptop battery PCB.

In both cases you can't do abolutely nothing.

1. Both chip's are sealed.

2. No software available.

For these Makita batteries i just buy a whole china replacement PCB that will never ever lock again and is recognized and charged by the genuine Makita chargers with abolutely no issues.

You can find them on Aliexpress, Ebay etc for 5-6USD.

The only down side of these PCB's is that they have voltage monitoring only for 1 cell group but if you use good branded cells voltage deviation is usually not a problem. 

But that is the only way you can repair a locked MAKITA BL/LXT battery.

Yes , the next chip is NEC F0513S , this chip has very long datasheet but i think i can read it , i have beeprog2 programmer and this programmer can read everything . Then i find a time i try to read full backup , if the reading be successful then i need to find the good one not locked and overwrite the locked chip , just i want to fix one time because is to hard method .

NEC chips considered most secured in copyright respects. They protected with passwords or Fuse bits to prevent unauthorised reading. So the easiest solution to fix this battery is like @torture suggested. 

Not really, I have the firmware (hex) of this chip MC908JK3E How has time to disassemble and check it ? The program memory is not long, it is short. First, we need to understand the PCB layout/schematic because understanding the schematic will help us to understand the firmware easier. How can create a schematic of the PCB ?

There is no solution worldwide to reset these original chips. We have done a big step forward by extracting the firmware, if someone could reverse engineer the schematic we can move next.

Hi , i can try to make a schematic then i got a battery with this chip MC908JK3E , the 14.4v battery PCB is not big .

Hello,

When I bought a couple of broken Makita batteries (14.4 and 18V) I noticed that there are different version made, through time:

LIPW001 1-873-711-11:

- Wires to the battery +/- tabs.

- Very little circuit, at the top and TL431, MC908JK3E, fusable link 15AH3 as main components at the bottom.

- Single connection tab (TH) next to plus battery connection.

LIPW003, 1-881-988-11

- Flex leads to all the pairs of cells

- LP324 and F0513 113KM, 15AH5 fuse.

- Two tabs next to the plus battery connection.

Third version is the potted one.

- BMS ML5203 Lapis Semi

- F0513 S 411KM

- Two fuses 30A K02 A

Realy tiny 0402 components, that will be very hard to RE.

I also have some Chinese copies that can trick the charger and still get a bricked battery charge. However, there is no balancing, only a thermal switch.

Small board:

These have a F9224 624K, and what seems to be a 1,27pitch programming port. There is a component that I cant find, marked with C2K2, 5 pins.

Larger Chinese copy:

Large 16 pin (mcu?)

Small 8 pin soic connected to the leds to show state of charge.

BM5031 chip

My idea was to make use of the 'intellegance' of the Chinese copy and add balacing and safety (fuse, thermal fuse). To create a good working replacement board for the Makita batteries. But the problem is time..