How To Restore A Laptop Battery

How To Restore A Laptop Battery – Since there aren’t many guides on reprogramming batteries and chips, I decided to make one, hoping it will help any newbies out there who don’t know how to proceed. Today I had the opportunity to work on a battery with a very strange combination of a FUJITSU battery with a BQ9000 chip. I have never seen this in 7 years of battery repair work. So let’s find out what happens to this battery.

Connect the battery to the NLBA device and press the START READ button. What can we see from the data?

How To Restore A Laptop Battery

1 – One of the cell groups reads 0 volts, which is the main reason for the chip failure.

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2: The values ​​of charging current and charging voltage are 0. This can happen for some reasons that the SYS pin is not connected to ground / this battery does not have a SYS pin / the battery is fully charged, but in this case, RSOC is 0%, etc. So this is another sign that the chip is locked.

3 – The current is 0 and the output LED of the NLBA device is OFF. Another sign that the chip is locked.

4 – If we press the BATTERY STATUS button, we can see that the END OF CHARGE ALARM has been activated. This status bit can be set if the battery is FULLY CHARGED or if there is a lockout or PF /permanent fault/ condition. In this case, since the RSOC is 0%, we conclude that the chip is locked.

From STEP 1: 1: One of the cell groups is reading 0 volts, which is the main reason why the chip crashed.

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So, knowing all this, there is only one solution. Opening the battery and replacing ALL cells and unlocking the chip.

I won’t go into the details of how to open the battery case etc. So when we remove the old cells from the box we can see what was the reason for the deadlock condition. Short circuit due to missing insulating pad between positive tab and box body. The battery is genuine, but it was still made by humans and humans can make mistakes. It should be noted that the negative is not only the lower part of the shell, but also the entire outer shell.

Knowing that there is a short circuit, we need to visually inspect the printed circuit board for possible damage. In this case, at least visually, it wasn’t there. Next, we need to identify the chip, because in some cases it can happen that it is incorrectly detected, and in this case it was detected as BQ8050. The reason for this is that NLBA identifies the chip from the static parameters of the battery, such as device name, manufacturer name, etc., and another reason is that you can find 2 completely different chips in 2 exactly the same batteries. So the software cannot be blamed if the chip is misidentified. In fact, some other software like BE2Works doesn’t have this feature at all, so I appreciate that, and misidentification is a very rare thing anyway.

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The next step will be to find and check the condition of the fuse. There are several types of fuses and their test points are different, but I will not cover all of them now, we will focus on this type. Put the multimeter into continuity or /buzzer/ mode and see if you should hear a beep or a closed circuit indication between test point 1 and test point 2 as in the picture, if there is no sound or the readings are an open circuit, that means the fuse has blown and it must be reset, but only AFTER unlocking and reprogramming the chip is complete. Next, we switch the multimeter to resistance mode and place one probe on test point 3 and the other probe on test point 1 or 2, and depending on the fuse model, you will see a resistance of about 10 to 50 ohms. This is the resistance of the heating element that melts the fuse. So we can confirm that the fuse is fine.

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Our next step is to spot weld our new cells and you need to make sure they have more or less the same chemistry and discharge characteristics as the old ones. Otherwise, the chip will incorrectly calculate the state of charge. The performance of the new cells can be different from the old ones and can be easily adjusted.

When connecting new cells to a circuit board, we ALWAYS start with the NEGATIVE connection first, because if we accidentally start connecting, the chip can lock up again, or the fuse can blow, etc.

In this case, the negative connection is marked on the PCB as LP5, then the 4.2 V connection LP4, the 8.4 V connection LP3 and finally the positive connection 12.6 V of the LP1 package.

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And as we can see, if the battery was opened correctly, it can be closed correctly without any problem.

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Next comes the most important part, unlocking the chip reprogramming. And here the NLBA will play a very important role, because the FUJITSU BQ9000 chip was not even tested by the developers, but everything works like a charm. This is because different battery manufacturers may put error codes in different areas of the DataFlash. Some software like UBRT for example claims to unlock BQ9000, maybe it will work with ACER batteries but not HP, Lenovo or DELL etc, personally tested! But NLBA, as we can see, also works with untested battery firmware.

We will go to the RESET tab, press NEW RESET, press READ SBS and since the chip will be misdetected as we mentioned above, we have to manually select it from the dropdown menu. 1 – I always like to read the information about the chip first. just to make sure it is in normal operation mode.

2 – Before trying to clear errors or anything, ALWAYS read the original EEPROM and save it first. Only because if something goes wrong, you can always write the original EEPROM to the chip.

3 – Now you can proceed to clear chip memory errors and change date, cycles, FCC. In this case, the FCC will be the same as the original because the new cells have the same capacity as the old ones. That’s 6 cells of 2200mAh each, so in a 3s 2p configuration this will result in a capacity of 4400mAh and that’s the value we need to enter in the FCC field.

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4 – When we finish the unlocking process, we need to press END RESET and go back to the BATTERY INFO tab to check the results.

As we can see the CHARGE VOLTAGE and CHARGE CURRENT values ​​have reappeared, the current is -11mA, this is what we want because the output LED is now lit and this means the battery can output voltage. The FULL CHARGE ALARM is now gone, which also means that the chip is unlocked. The cycle count is 0, the FCC is also changed to the desired 4400mAh and the battery reports 100% health. The battery is now new and will work flawlessly in the laptop.

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The last thing you need to do now is run a full charge and full discharge calibration cycle to confirm normal operation.

Finally, I would now like to compare some market prices to show why NLBA is the best choice from my personal experience.

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BE2works – Current price $350. Does not include hardware. Not compatible with BQ9000 family, BQ40xxx and results are not consistent with other chips and many other issues. If you can’t reset the battery yourself, they offer remote unlocking for $10 per battery. Support for official NLBA chips is here on the forum FREE and FAST!

UBRT- The price of a license that supports the BQ9000 is $800 per year, CRAZY! Not working with personally tested LENOVO BQ9000. Does not include hardware. No forum support.

NLBA- License renewal $149 per year. Tell the portable battery service. I received a refund for the hardware + license for 1 week. Most importantly, it actually supports all the chips it claims to.

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