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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: Lower Anchors and Tether for Children (LATCH) System
The LATCH system holds a child restraint during driving and in an accident. This system is designed to make installation of the child restraint easier and reduce the possibility of improperly installing your child restraint. The LATCH system uses anchors in the vehicle and attachments on the child restraint. The LATCH system eliminates the need to use seat belts to secure the child restraint to the rear seats.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.