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 power steering (EPS)
The power steering uses a motor to assist you in steering the vehicle. If the engine is off or if the power steering system becomes inoperative, the vehicle may still be steered, but it will require increased steering effort. The EPS is controlled by a power steering control unit which senses the steering wheel torque and vehicle speed to command the motor.Kia Stinger (CK) 2018-2023 Owner's Manual: System malfunction
When the “Check System” warning message appears, the system is not working properly. In this case, have the vehicle inspected by an authorized Kia dealer. WARNING The Driver Attention Warning system is not a substitute for safe driving practices. It is the responsibility of the driver to always drive cautiously to prevent unexpected and sudden situations from occurring.