Update of RM and FCC takes place after each resistance grid-point update, at the end of discharge, and at the exit of relaxation mode.

FCC consists of three parts:

DataRAM.Full Charge Capacity( ) = Q_start+ PassedCharge + RM

Components of FCC are indicated in an example in Figure 2-4.

Figure 2-4 Components of DataRAM.Full Charge Capacity( ) Value

1. Q_start is the charge that would have passed to make DOD = DOD₀ from a fully charged state (DODcharge). For a fully charged battery Q_start = 0. Q_start is recalculated at the exit of relaxation mode. In the case of constant current, it is simply Q_start = Q_max × (DOD₀ – DODcharge), but for the constant power case a voltage simulation is run. DODcharge is assigned equal to DOD₀ at first DOD₀ update after charge termination by taper current. Note that DODcharge is somewhat higher than 0 because chargers typically do not charge a battery to full.
2. PassedCharge is the coulomb count integrated during the present discharge or charge and set to zero at every DOD₀ update.
3. Remaining capacity is calculated after each resistance grid-point update and at the end of discharge

DataRAM.Remaining Capacity( ) (RM) is calculated using a voltage simulation. The GG starts a simulation at the present DODstart = DOD₀ + PassedCharge/Q_max and continues calculating voltage V(DODx,T) = OCV(DODx,T)+ I×R(DODx,T) by incrementing DOD with dDOD increment of 4%. DOD[i]=DODstart + dDOD×I. This incrementing is continued until the simulated voltage V(DOD[i]) becomes less than DF.Terminate Voltage. Once that happens, the final DOD is revealed. DataRAM.Remaining Capacity( ) = (DODfin-DODstart)×Q_max.

Current that is used in the simulation is the average current during the present discharge (several types of averaging can be selected using DF.Load Select data flash constant). A simulation can run in constant current mode (DF.Load Mode = 0) or constant power mode (DF.Load Mode = 1).