Tool/software:
Hello Gentlemen,
I have been using BQ28550 in my design for the past 10 years. I am facing an issue in the field that my battery has a capacity of 19.3Whr but the fuel gauge BQ28550 is reporting >20Whr. As part of the investigation, I have tried running charge(2A) /Discharge(-1.3A) cycle.
1st cycle:charge(2A) /Discharge(-1.3A)
BQ28550 was reporting capacity in mAh throughout the cycle and at the end of discharge the max error switched from 4% to 2% and FCC decreased by 4%.
2nd cycle:charge(2A) /Discharge(-1.3A)
BQ28550 was reporting capacity in Whr throughout the discharge cycle with max error is 2% and the FCC values decreased by less than 0.1%.
Here are my questions to understand this scenario
1)Does BQ28550 has a learning cycle? if so please share the procedure.
2) What would be the probable cause for the fuel gauge to report a higher capacity (>20Whr) than actual (19.3Whr).
3) What would be reason for the fuel gauge BQ28550 to reports its capacity in mAh in cycle-1 and whr in cycle-2
Regards
Prakash
Discharge 3_6 Ohm log cycle -2016-1.logDischarge 3_6 Ohm log cycle -2016-2.log
