I don't have the irdrop removed, but that is very small during charging (.07 ohms * 10 amps = 0.7v). Unfortunately, the kids have the computers tied up so I can't count the number of samples right now.
Thanks that does look fairly linear regarding kWh per GID for a charging event and probably very similar for a discharging event. Lithium-ion cells have a high coulombic efficiency, but it does drop a bit at the extremes of the SOC.. perhaps that is the non-linearity that EVNOW is seeing. Your plot may even display the coulombic efficiency curve, and that means the software is accounting for it, not just a simple guess by using the voltage.
I think GID does represent energy storage, within those limitations. Next question: will the GID display change as the battery ages?