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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: Driver position memory system
Driver Position Memory System is the facility that enables driver’s seat, leg extension, steering wheel, exterior mirrors, cluster and head-up display (HUD) to be controlled with a simple button operation, which allows a driver to recall memorized driving positions and automatically control them. - Driver’s seat/Leg extension/Steering Wheel/Exterior mirrors: Location - Cluster: Brightness of lighting - Head Up Display (HUD): Height, rotation and brightness.Kia Stinger (CK) 2018-2023 Owner's Manual: Steering Gear Rack, Linkage and Boots
Repair procedures Inspection 1. Check the steering wheel free road. (1) Turn the steering wheel so that the front wheels are facing straight ahead. (2) Measure the distance where the steering wheel can be turned without moving the front wheels.