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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: ETC (Electronic Throttle Control) System
Specifications Specification [Throttle Position Sensor (TPS)] Throttle Angle(°) Output Voltage(V) [Ref=5V] TPS1 TPS2 0 0.0 5.0 10 0.48 4.52 20 0.95 4.05 30 1.■ Head lamp - Type A 1. Remove the service cover clip on the wheel housing. 2. Remove the headlamp bulb cover by turning it counterclockwise. 3. Disconnect the headlamp bulb socket-connector. 4. Remove the bulb-socket from the headlamp assembly by turning the bulb-socket counterclockwise until the tabs on the bulb-socket align with the slots on the headlamp assembly.