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The battery is in the trunk under the compartment cover.
When replacing the battery, disconnect the negative (-) cable (1) and remove the positive (+) battery fuse box (2).
Remove the battery mounting bracket (3).
WARNING - Touching metal surfaces in the trunk under the compartment cover

Do not touch metal surfaces in the trunk under the compartment cover while the engine is operating or hot. Doing so could result in serious personal injury. Turn the engine off and wait until it cools down or wear gloves to replace the battery from the luggage room.
Your vehicle has a maintenance-free, calcium-based battery.
When recharging the battery, observe the following precautions:
Reset items
Items should be reset after the battery has been discharged or the battery has been disconnected.
Kia Stinger (CK) 2018-2023 Owner's Manual: LKA system operation
To activate/deactivate the LKA system: With the ignition switch in the ON position, press the LKA system button located on the instrument panel on the lower left hand side of the driver. The indicator in the cluster display will initially illuminate white. When the indicator (white) activated in the previous ignition cycle, the system turns on without any control.Kia Stinger (CK) 2018-2023 Owner's Manual: Emergency Fastening Device (EFD)
Description and operation Description The Emergency Fastening Device (EFD) operates at the same time with the Seat Belt Pretensioner when the deployment condition is satisfied in the event of a collision. It is an auxiliary equipment that instantly pulls the seat belts toward the anchor in the event of frontal collision to protect the driver and front passenger from breaking away.