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: Heated Oxygen Sensor (HO2S)
Specifications Specification HO2S [Bank 1/Sensor 1] Item Specification Heater Resistance (Ω) 2.5 - 4.0 [20°C(68°F)] HO2S [Bank 1/Sensor 2] Item Specification Heater Resistance (Ω) 3.3 - 4.1 [20°C(69.8°F)] Description and operation Description Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is installed on both upstream and downstream of the Catalytic Converter to detect the air/fuel ratio and send it to the ECM.Kia Stinger (CK) 2018-2023 Owner's Manual: Wide Sunroof Switch
Components and components location Components Repair procedures Inspection 1. Disconnect the negative (-) battery terminal. 2. Remove the overhead console lamp (A) after loosening the mounting screws. 3. Disconnect the overhead console lamp connectors (A).