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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: Sub Fuel Sender
Repair procedures Removal 1. Release the residual pressure in fuel line. (Refer to the Fuel Delivery System - "Release Residual Pressure in Fuel Line") 2. Switch "OFF" the ignition and disconnect the negative (-) battery terminal. 3. Remove the rear seat cushion.Kia Stinger (CK) 2018-2023 Owner's Manual: Shift to P to edit settings
This warning message appears if you try to adjust the User Settings while driving. For your safety, change the User Settings after parking the vehicle, applying the parking brake and pressing the parking “P” button. Head-Up Display (HUD) Enable Head-Up Display : If this item is checked, Head-Up Display will be activated. Display Height : Adjust the height of the HUD image on the windshield glass.