I have a problem where the battery won't charge due to an error (probably in the battery's EEPROM). This is probably because the FCC value is much too high (61.037mAh instead of 6.000mAh). I can only guess that this is why the battery won't charge. However, I have noticed that the value is often much too high.
Only once the charging process has started, it has risen to 22mA. After restarting the charging process, the value goes from -13mA to 0mA and remains there, as can be seen in the screenshot. After many attempts, the charging process did not exceed 0mA. You can tell that the charging process wants to start, but something in the software seems to be preventing it.
Battery: BTP-67EM (14,8V/6Ah) (the battery is unlocked)
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1. The cells are unbalanced -> balance the cells using a power supply
Here is a tutorial on how to balance the cells:
https://www.laptopu.ro/2026/01/09/how-to-repair-a-laptop-battery-replacing-the-cells-and-unlock-reset-the-chip-045a20/
2. The EEPROM seems corrupted -> paste a picture with the battery info page after you read the static and dynamic parameters.
As i said - everything is fine beside the FCC. I guess if the FCC value were correct, the battery would charge normally.
In theory, the battery should charge regardless of the values of these individual cells. There is no reason why the battery should not be charged slowly using the NLBA.
Unfortunately, I cannot fix the EEPROM because I do not have a license for it.
You should first fix the imbalanced cells. That could be the main reason why the battery is not charging or discharging.
everything is fine beside the FCC
No.
This battery has three different issues and FCC is just one of a batch.
Look carefully on the picture, problematic parameters were already highlighted by NLBA1 software, but they additionally highlighted in color rectangulars to bring your attention.
1. Unsafe undervoltage conditions on cells 1 and 4 (pink area)
2. Too big unbalance (yellow area )
3. FCC bug (violet area)
As result chip reduced charge current to small value of 300mA (blue ellipse)
Problem 1 and 2 could be solved with external cells balancer like iMax B6 or by regulated power supply. To fix problem 3 chip should be reprogrammed.
everything is fine beside the FCC
No.
This battery has three different issues and FCC is just one of a batch.
Look carefully on the picture, problematic parameters were already highlighted by NLBA1 software, but they additionally highlighted in color rectangulars to bring your attention.
1. Unsafe undervoltage conditions on cells 1 and 4 (pink area)
2. Too big unbalance (yellow area )
3. FCC bug (violet area)
As result chip reduced charge current to small value of 300mA (blue ellipse)
Problem 1 and 2 could be solved with external cells balancer like iMax B6 or by regulated power supply. To fix problem 3 chip should be reprogrammed.
I realize that the cells are not balanced. But these are not that critical values yet – although I would criticize that this could easily be solved technically by NLBA.
Since the FCC value is incorrect, a checkbox could be programmed here to ignore this value. I have often encountered this strange value.
If the battery would at least charge at 300mA, great - my problem would be solved. Then I could at least charge it a little and calibrate it afterwards – but unfortunately, the software won't let me do that.
I also think the repair function is nice, but let's be honest – it's WAY too expensive. That's a real shame.
Unfortunately, I can use the NLBA less and less because it doesn't do what I need or want it to do. Many things that could help are also not adjustable. And some things that sometimes helped before no longer work or have been disabled. I would like to see a lot more settings that I can adjust at my own risk.
But these are not that critical values yet
970mV unbalance is far outside any reasonable limits
Battery could not normally work with such a big unbalance. It will not allow to full charge the battery because cell with higher voltage will go beyond safety voltage.
Since the FCC value is incorrect, a checkbox could be programmed here to ignore this value
FCC is already ignored in the NLBA1 software. But it is not ignored in laptop. Battery with such a big FCC could not work normally in laptop.
I have often encountered this strange value
Yes, it is well known issue on the batteries stored for too long. It was described many times on our forum. There is even tutorial with step by step guide on how to fix this issue.
but let's be honest – it's WAY too expensive. That's a real shame.
It is the best price on the market.
Competitors product costs $1100 per yearly subscription what is 4x expensive.
Then I could at least charge it a little and calibrate it afterwards
Wrong assumption.
You could not calibrate the battery with such a big FCC in a reasonable way. If you would read the forum or Texas Instruments documentation for their fuel gauges you would know that FCC is not calibrated in one go. It has so called FCC_RELEARN_LIMIT or FCC_UPDATE_STEP parameters which is typically 512mAh in upper direction and 256mAh in downward direction.
So in your case FCC will be reduced after first calibration cycle to a value
FCC = 61037 - 256 = 60781 mAh
Which is far outside the reality
Lets assume your battery has real capacity 5000mAh. Then you will need 219 calibration cycles to bring FCC value back to normal value
61037 - 5000 = 56037
56037 / 256 = 219 cycles
It will take several monthes to do this job. Also cells condition will be degrades after so many useless cycles. It will have 102 + 219 = 321 cycles afterwards.
FCC correction by NLBA1 software takes just several minutes and this is the power of this product.
I would like to test this and reset the chip. But as I said, I don't have a license for it... This means that the battery will end up as electronic waste.
Unfortunately, the pricing of the chip reset option doesn't make sense for us infrequent users, and it makes more sense to just buy a new battery. Repairing batteries is even more difficult due to labor costs. If you only perform a few resets a year, it's absurd to spend $289 on it. It makes no economic sense at all. I would think it would be good (for us occasional users) if perhaps 10 chip resets per year were free of charge.
We will implement a specific licence in the future for those who repair a small number of batteries per year.
perhaps 10 chip resets per year were free of charge
We already offer 10 free days of Chip Reset License for any new device purchase. So customers could check how it works and if they really need it.
absurd to spend $289 on it
It costs $269. Also there are discounts for customers who repair small battery quantity.
I would like to test this and reset the chip.
Precharge Cell 1 and 4 to normal level. Then me will fix FCC for you remotely over AnyDesk session.
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