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You cannot measure the energy capacity of the battery with a simple test.
The two best measures are 1) take the battery out of the car, take it to a laboratory and use specialized equipment.
And 2) Charge to 100%, drive to completely empty, charge back up to 100%. Measure everything carefully.
What Kia has done is ask the Battery Management System in the car to tell us what it thinks the energy capacity of the battery is.
This measurement is called the State Of Health (SOH).
Your battery showed 30.7%. This is a false reading. It cannot be so low.
Either there is a typo and it wasn't really 30.7 they saw, or the BMS in the car is not working correctly.
Resetting the BMS to show SOH = 100% does not help us much.
Obviously the SOH will now be 100%. But we have no idea what the actual battery energy capacity is.
Perhaps the reset fixed the bug in the BMS. Perhaps not.
They need to do a simple test like charge the car to 100% and see how long it takes, and how much energy is going into the battery.
If they get the same kind of results you did, then obviously there is something wrong.
You mentioned earlier they did an 'Energy Draw' test. Did they ever explain this to you? What was the result of the test?