Contents:

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: Inhibitor Switch
Specifications Specifications Item Specification Output type PWM Power supply (V) 5 Components and components location Components Location 1. Inhibitor switch 2. Manual control lever Schematic diagrams Circuit Diagram Repair procedures Inspection Inspect the connector thoroughly for looseness, poor connection, bending, corrosion, contamination, deformation, or damage.Kia Stinger (CK) 2018-2023 Owner's Manual: Headlamp Leveling Actuator
Components and components location Circuit Diagram Repair procedures Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the headlamp assembly. (Refer to Lighting System - "Headlamps") Installation 1. Install the headlamp assembly.