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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: Heating, Ventilation And Air Conditioning
Special service tools Special Service Tools Tool (Number and name) Illustration Use 09977-3R000 Disc & hub assembly bolt remover Removal and installation of disc & hub assembly. Troubleshooting Troubleshooting Problem Symptoms Table Before replacing or repairing air conditioning components, first determine if the malfunction is due to lack of refrigerant, air flow or compressor.Kia Stinger (CK) 2018-2023 Owner's Manual: Rear Glass Defogger
Components and components location Component Location 1. Integrated body control unit (IBU) 2. Rear glass defogger 3. Rear glass defogger switch