Load Test

When discharging the battery for 15 seconds at half the rated current, the battery voltage should be more than the voltage shown in the following table. See Fig 1.

Fig 1: Load Test Specifications
Courtesy of KIA MOTORS AMERICA, INC.
When the voltage is not within specification, test 2nd load test again, and if not, do the re-charge.
If the battery voltage (left alone within 2 hours after re-charging) is over 12.5V and the voltage after load test is over the standard value, this battery can be used.