Contents:

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: How does the air bag system operate?
Air bags are activated (able to inflate if necessary) only when the Engine Start/Stop button is turned to the ON or engine is running. The appropriate air bags inflate instantly in the event of a serious frontal collision or side collision in order to help protect the occupants from serious physical injury. There is no single speed at which the air bags will inflate.Kia Stinger (CK) 2018-2023 Owner's Manual: Variable Charge Motion Actuator (VCMA)
Components and components location Components ECM directly controls the actuator and the rotation of motor operates the VCM flap of intake manifold in link structure to create tumble in air. Mounted inside the actuator, the motor and position sensor sense the position of flap and send feedback to ECM to determine the current location of flap and detect abnormal operation due to adherence of foreign substance.