Good morning dears, I am still not 100% using the NLBA1 analyzer correctly and I have 3 questions that I would like you to help me with why those values appear:
First: I have a new battery (not original) that I bought and placed in a laptop which after several days gave me a problem that when it reached 30% it discharged quickly, I placed it in the analyzer to see what problem I had and in These 3 images that I attach I want to know that in photo #1 where it says charging current I get a value of 2304 mA which when charging starts with 2304 mA but goes down until it reaches 773 mA photo #2 does not reach that load otherwise at 773 mA, why does that happen? and I checked the cells in photo #3 and they are not so good that we always say bad cells, after that I bought a new battery (not original) from another supplier and I got very different data as in photo #4, it is not the same charging current value of the previous battery and when charging it is stable at that charging current photo #5, but I still get the bad state of the cells photo #6.
Second: My question is the first battery (photos #1-2 and 3) what damage would it have that does not allow me to charge at the value that the analyzer gives me, which is 2304 mA?
Third: And why do the second battery (photos #4-5 and 6) change some values, for example the charging current? It is supposed to be the same model and it should work the same, what could be done about the cells so that I do not get those bad battery states?
I thank you in advance for your answers and clarifications.
when charging starts with 2304 mA but goes down until it reaches 773 mA photo #2 does not reach that load otherwise at 773 mA, why does that happen?
Because you should check not only Charge Current but Charge Voltage too. Lithium batteries should be charged by CV-CC principle and Charge Voltage is always of top priority then Charge Current because it affects pack safety directly. You missed that so you dont understand what is happening. Cells voltage should never exceed maximum charge voltage so all chargers have this software or hardware limitation.
In your case first battery has 13050mV maximum charge voltage which corresponds to 4350mV per cell for 3S configuration.
So when charge was started with 2304mA total voltage increased to 13050mV and charger started to decrease a current to keep voltage within safety range.
As you could see at this point cell 1 and cell 2 already reached their maximum limit and even slightly exceeded it.
On contrary if it would continue with same 2304 charge current cells voltages would go above safety limit and cause explosion or fire. To preven unsafe scenario NLBA1 started to decrease a current.
after that I bought a new battery (not original) from another supplier and I got very different data as in photo #4, it is not the same charging current value of the previous battery and when charging it is stable at that charging current photo #5, but I still get the bad state of the cells photo #6.
Second battery has cells of poor quality. During charge it has unbalance of 93mV which causes overvoltage on Cell 2. While other cells voltages still far below max charge voltage so total voltage is less then 13050 and charger continue to apply big charge current like requested from the chip.
Second: My question is the first battery (photos #1-2 and 3) what damage would it have that does not allow me to charge at the value that the analyzer gives me, which is 2304 mA?
It is not a damage. It is safety feature to prevent overvoltage like was explained above.
Third: And why do the second battery (photos #4-5 and 6) change some values, for example the charging current?
These batteries are not genuine and produced by different manufacturers. So they differently programmed some parameters.
Its not the issue that one battery has 2.3A charge current and other has 1.98A value. They issue is with cells quality. First battery has better quality but EDV setpoints not properly preprogrammed so RSoC jumps from 30% like was reported. Second battery has probably same RSoC issue and additionally big internal resistance of the cells and big cells unbalance under load.
what could be done about the cells so that I do not get those bad battery states?
You could return the batteries to supplier because they are new and protected by a warranty.
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