Thanks for the funded answer! I'm asking from a practical point of view, because I'm trying to do some cycle life tests on LiFePO4 batteries manufactured by BYD (200Ah) and CALB(100Ah and 180Ah). And I wanted to think of a way to test the capacity without discharging it completely, I thought maybe it is possible to discharge it for example only to a defined 50% SOC and then calculating the theoretical capacity without testing the last 50%.
Because which indicator could be used to measure capacity in a real time situation, for example if the battery is used in a vehicle or as an energy storage system at home or even in a power plant?
I know that there are a lot of models ( data-driven or electrochemical-based ) to estimate the total capacity or capacity fading over time, but how does the BMS actually measure the capacity?
Is it also just an estimation based on a battery model?