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: Intake Actuator
Description and operation Description Located in the blower unit, the intake actuator regulates the intake door by a signal from the control unit. Pressing the intake selection switch will shift between recirculation and fresh air modes. Repair procedures Inspection 1. Turn the ignition switch OFF. 2.Kia Stinger (CK) 2018-2023 Owner's Manual: Rear Suspension System
Components and components location Components Location 1. Rear upper arm rear 2. Rear upper arm front 3. Rear cross member 4. Rear differential 5. Rear stabilizer bar 6. Rear shock absorber 7. Rear axle 8. Rear assist arm 9. Rear lower arm