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: Knee Airbag (KAB) Module
Description and operation Description Installed inside the crash pad, the knee airbag (KAB) protects the driver in the event of a frontal crash. The SRSCM determines if and when to deploy the KAB. Never attempt to measure the circuit resistance of the airbag module (squib) even if you are using a specified tester.Components and components location Component Location 1. Heater Unit Components [LH] 1. Air guard 2. Anti noise pad 3. Mode control actuator 4. Shower duct [LH] 5. Temperature control actuator 6. Console ON/OFF actuator 7. Console temperature control actuator 8.