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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: Injector
Specifications Specification Item Specification Coil Resistance (Ω) 1.4 - 1.6 [20°C(68°F)] Description and operation Description The GDI injector is similar to a standard injector, but sprays fuel at a much higher pressure directly into the combustion chamber and has a swirl disc to get the fuel swirling as it exits the nozzle.Kia Stinger (CK) 2018-2023 Owner's Manual: Vehicle recognition
Some vehicles ahead in your lane cannot be recognized by the sensor as follows: - Narrow vehicles such as motorcycles or bicycles - Vehicles offset to one side - Slow-moving vehicles or suddendecelerating vehicles - Stopped vehicles - Vehicles with small rear profiles such as trailers with no loads A vehicle ahead cannot be recognized correctly by the sensor if any of following occurs: - When the vehicle is pointing upwards due to overloading in the trunk or luggage area.