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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: Power Door Lock Switch
Repair procedures Inspection Diagnosis With KDS 1. The body electrical system can be quickly diagnosed for failed parts by using vehicle diagnostic system (KDS). The diagnostic system (KDS) provides the following information. (1) Self diagnosis : Checks and displays the failure code (DTC) (2) Current data : Checks the system input/output data state (3) Actuation test : Checks the system operating condition (4) Additional function : Other controls such as the system option and zero point 2.Kia Stinger (CK) 2018-2023 Owner's Manual: Curtain Airbag (CAB) Module
Description and operation Description Installed inside the headliner, the curtain airbags (CAB) protect the driver and passengers from danger in the eThe SRSCM determines deployment of curtain airbag based on side impact sensor (SIS) signal.The SRSCM determines deployment of curtain airbag by using side impact sensor (SIS) signal.