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: Electric Waste Gate Actuator (EWGA)
Description and operation Desrcription Installed on the turbocharger, the Electric Waste Gate Actuator (EWGA) operates the vane in the Waste Gate Turbocharger (WGT) and regulates the compressed air amount based on the PWM signal from the ECM. This actuator consists of a DC motor which actuates the vane, a 2-step gear which increases torque of the DC motor, a position sensor which detects status of the vane, and an electric control unit which drives the DC motor.Kia Stinger (CK) 2018-2023 Owner's Manual: Forward Collision-Avoidance Assist (FCA) System
Description and operation Description – The Forward Collision-Avoidance Assist (FCA) radar sends a signal to detect the vehicle in front, based on the calculated distance the FCA applies the brakes in order to avoid or lessen collision with the vehicle in front due driver distraction or late braking response.