Reprogramming and Replacing Cells in Toshiba PA3509U-1BRM 10,8V 7050mAh Battery (34F04WP, 629 309B)

I have a battery in the Toshiba Tecra M5.
Old battery - 4 years, at ~ 15% of its nominal capacity. Works, but short ...
I assume that 4 years of intensely used cells have simply worn out and grown old.

The battery is built from 9 cells in 3 parallel connected packages.
The links can be easily purchased.

The battery has a controller on the following systems:
- 34F04WP (on the second line K627W)
- 629 in the second line 309B, there is also an icon - in the shape of the letter M before the inscription 629

Has anyone come into contact with such systems? I wonder how to reprogram it.
34F04WP is probably a memory chip running on the I2C bus.

I wonder where best to buy decent links. For example, the Barimex store sells good things. You can order a hot packet there, which would suit me.

Added after 5 [hours] 5 [ minutes]:

 Battery photos:

As with most Toshib, the battery itself is eeprom. The driver is located on the laptop's motherboard.
The memory of the 34 series is used in your battery. I have not yet come across this memory and I do not know what program it can read.

As for the links, I have not bought links in this company yet, but if you have no where to weld the links, I think it will be a good solution to order such a package with them.

What should I read / program this memory. The memory is different, but maybe similar to the other Toshiba.

I am also wondering if there is no problem with exchanging cells of 3.6 to 3.7V.
It seems to me that they should work well. The charging and cutting voltage are probably the same.

I received the hot links yesterday. I wound up, recharged (charged to 4.08 - 4.20V), laptop works on battery.
I hope that the differences in voltage between the cells will level out during use.

The capacity indicator has gone down to 291 mWh (3.19%) and has been working for 2 hours. The laptop shows a voltage of 11.2V (3.73V per cell).

I wonder when he will die and if he calibrates properly.

After the first cycle, the battery will not be calibrated accurately. You will have to repeat 2 or 3 times the charging and discharging cycles.

The voltage on the cells will not be evened out. It would be better to level them yourself. Unloading those sections that have higher voltages, e.g. a 12V 21W bulb.

Differences in voltage actually remain after subsequent cycles. With discharged links, I had a voltage of 3.0; 3.3; 3.3. Cells with higher voltage discharged to 3.0 bulb. After charging, the differences were in the order of 0.03V.
During calibration in the first cycle the charge / discharge showed ~ 60% capacity, in the second cycle ~ 87% in the third 89.8% and so it has already been.

The battery lasts an average of 3 hours in normal operation - it works like new.

Recently, Mariusz asked me how to dismantle the described battery. I will confuse a brief description, it may be useful to someone.

The battery housing is glued, but it should not be cut. Rather, you need to skillfully undermine with a wide screwdriver.
I used a wide penknife screwdriver (about 10mm wide and 1mm thick). You need to pry a little bit along the groove where the top and bottom of the housing meet. You need to find a comfortable place near the corner to start distributing the housing.
I, from what I remember, started somewhere along the shorter (lateral) wall of the battery.
The battery can be folded down after such a dismantling - it slams. I did not even have to glue it, somehow it sticks to my laptop.

In my battery, all cells were in a similarly weak condition (to be replaced). Another thing is that the battery lasted very long and intensely.

As for the battery in which I exchanged the cells:
Works all the time without problems (over a year). For the time being, it has retained 88% capacity (as I mentioned and calibrated it was 89%). The laptop is also used daily on batteries.

The 3404WP probably is the ST M34F04WP I2C 4Kbit EEPROM.

Dodano po 57 [minuty]:

celsoken wrote:

The 3404WP probably is the ST M34F04WP I2C 4Kbit EEPROM.

And the second IC is Mitsumi MM1309B.