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[Solved] LENOVO - L15C4A02 -BQ40Z695A FW V3.01 after replacing cells can not unseal again

Fogonazo
(@ventas)
Prominent Member Customer

I have unsealed succesfully to backup eeprom, then I recelled and after that voltages are read slowly and can not unseal anymore.

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Topic starter Posted : 19/09/2023 9:14 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

 Communication is not stable, in this case unseal is not guaranteed. 

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Posted : 20/09/2023 12:52 am
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

Try to unseal with Power On option and 11000 voltage value. 

 

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Posted : 20/09/2023 12:54 am
Fogonazo
(@ventas)
Prominent Member Customer

@djibattworkshop I have tried with different voltages without success.
But what I did to solve this was to get the old cells (they were at 3,8 V each) that was the voltage that I could unseal before. I made all the changes in NLBA and EV2300, then I unsoldered the old cells and put the new ones. Now it seems OK, I only have to charge and discharge with suggested relax times. 

What I have noticed that at present voltages it takes time to read the values. I will see how will work after calibration.

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Topic starter Posted : 20/09/2023 1:49 pm
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