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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: Headlamp Leveling Unit
Components and components location Circuit Diagram Description and operation Description According to driving environment and loading state of vehicle, headlamp lighting direction is changed to keep the driver's visibility range and to protect the driver's vision from glare, aiming at safety driving. Sensor integrated ECU mounted on the rear center arm drives the actuator mounted on the headlamp after sensing the input signal for the static change of vehicle.Kia Stinger (CK) 2018-2023 Owner's Manual: Power Seat Control Switch
Repair procedures Inspection Diagnosis With KDS 1. The body electrical system can be quickly diagnosed for failed parts by using the vehicle diagnostic system (KDS). The diagnostic system (KDS) provides the following information. (1) Self diagnosis : Checks and displays the failure code (DTC).