I have an 800 mah lithium cell with a bq27541V200 circuit. Also in the battery is an msp430 that reads the data from the BQ via its HDQ. The msp also connects to, and makes the data available to, the outside world (hosts) via its own I2C. The msp also operates up to 4 LEDs in the battery. The LEDs indicate SOC. One of the hosts is a charger. When charging, the LEDs function. When full the four LEDs draw 15 ma. I have the VSS of the MSP and the VSS of the BQ together at the Cell-' Therefor, at the end of the charge cycle, as the battery sets in the charger, there is a 15 ma load on the cell. Because this 15 ma is returned to the cell-, the BQ is not seeing this load.
My concern is that the BQ will assume the battery is at rest and update the qmax, etc when in reality, there is a small load on the cell. Would this small amount of current have an affect on the accuracy of the SOH?
dpk