I have setup the bq27501 with a single Li-Ion cell with a design capacity of 1220mAh.
When configuring the gas gauge, I entered the design capacity as 1220mAh as I proceeded through the bqEASY wizard. I also set the minimum operating voltage as 3.0V
The wizard put the battery through several discharge cycles where it brought the voltage well below 3.0V and it finally determined the chemistry to be code 0147 with an error of 1.78%
During my subsequent testing and cycling I noticed that FullChargeCap is only 990mAh and has remained at this value through 10 discharge cycles. Full AvailCap however has changed from 990 to 995mAh but it does not actually add to the capacity from which the gauge measures. My questions are as follows:
1. What is the difference between FullChgCap and FullAvailCap and their uses?
2. How are these variables calculated or determined by the gauge when I specific design capacity to be 1220mAh? The gauge reaches 0% SoC well before cell voltage reaches 3.0V.
3. How are these values updated during normal operation (after initial calibration) as a result of aging etc?
4. What is the difference between RemCap and NomAvailCap and their uses?