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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: Hydraulic System
Oil pressure characteristics input Oil-pressure characteristics input Solenoid valve oil-pressure characteristics input procedure 1. Perform the oil-pressure characteristics input procedure using the KDS. 2. Click the "OK" button after checking the condition.Kia Stinger (CK) 2018-2023 Owner's Manual: Integrated Memory Seat (IMS) System
Specifications Specifications Memory Power Seat Unit Item Specifications Rated voltage DC 12 V Operating voltage DC 9 - 16 V Operating temperature range -22 - 167°F (-30 - 75°C) Dark current Max.