I want to monitor the capacity of a 7.4V, 2200mAH Li-ion battery. I have found a that LTC4150 coulomb counter can able to measure the battery capacity. So, suppose I have connected a fully charged battery and monitor the battery capacity. So, after draining the battery to a some amount, what value it will show through a controller, the remaining battery capacity or the amount of AH I have used? I think it will show the amount of battery capacity I have used as per as its calculation of coulomb charge formula given in datasheet. So, if it works like this, then how can I estimate the battery capacity if it is not fully charged? (if 70-90% charged is present and connecting to the load).
1Ah = 3600 • GVF • RSENSE Interrupts (8)
RSENSE= Imax* 50mV
Software can choose value for empty or full.
Using suitable up-down counter. Initialize Count = 100% then count down with ratio to indicate capacity and count up to full .
Reinitialize after CC to CV to 10% CC cutoff = 100%
Cutoff use if capacity is <=10% or Vbat<=3V
But some calibration error checking is needed, something like...
then if count down = 10% is reached but Vbat > 3.4 add count correction factor
if Vbat <=3V and count is > 10% reset to 0% and report error difference.