Tool/software:
Hello. I'm not sure if this question has been covered already. We have a design in development that uses the bq34110 (the BQ34110PW specifically). We've repeatedly tested this gas gauge and consistently run into the same issue. I know it is for applications where the battery is only rarely discharged, but we wanted to test in all conditions. We have performed complete discharge tests on multiple units, multiple times. We know that at the beginning of the tests (battery full charged and BQ34110PW reporting correctly, battery full charged). As we run down the battery the reported charge seems to be counted correctly. The battery is spec'd at 4930mAh and the gas gauge reports ~4750mAh have passed through it during discharge. However, on charging, we consistently see the BQ34110PW only counts ~3550mAh over a complete charge. We can confirm that the battery was in fact completely discharged. Why might this be? We've seen it said we could perform multiple charge/discharge cycles for calibration, but this is unacceptable for a production line setting. We can't have units go out that report funky values for several charge/discharge cycles. Has anyone encountered this? I am a EE. I can provide our schematic (dragged into editor). We followed the application notes. I do not have much detail on the code, but if that is needed I can have our FW engineers provide that information. Let me know what you can.
