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BQ40Z50-R1: Problems with Learning Cycle for LiFePO4

Simon Stegner
Prodigy 150 points
Part Number: BQ40Z50-R1

Hi,

I did a learning cycle for an 4S3P battery with BQ40Z50-R1 and ANR26650-M1B (ChemID 465). According to SLUA777 after a calibration of the BMS (hint missing in the documentation) I followed the instructions from the documentation.

Starting with discharging the Battery both stated methods didn't work out properly for me (see 4.2.1). Every flag occured like in the description, but UpdateStatus never updated to a higher level (e.g. 05 or 06 or 0e). Even the REST-Flag occured.

1) Every cycle had a change of ~7500mAh, but BQ FullChargeCapacity is only 7047mAh. How could this happen?

2) Why is Cell Qmax much higher than 7500mAh?

Device Name = bq40z50R1
Firmware Version = V1_06_BLD0036


See attached logfiles and configurations.

Thanks for your hint/explanations

Simon