Used EVs will become more available and a buyer needs to evaluate the full charge capacity within a couple of hours:
- 100% SOC kWh ~= charge_kWh / (% SOC_1 - % SOC_2)
- % SOC_1 - beginning SOC from test charge
- % SOC_2 - ending SOC from test charge
- charge_kWh - how much charge was added
The greater the change in % SOC, the more accurate the expected 100% SOC kWh.
My test at the Toyota dealer, 2 hours, estimated the battery full capacity at ~27.0 kWh. Recently, I did a full charge test and measured 30.4 kWh which accounting for vehicle charger efficiency, ~92-95%, gives 28.0-28.5 kWh.
Bob Wilson