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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: AVN System
Components and components location Component Location 1 . AVN head unit 2. AVN front monitor 3. External amplifier 4. Multimedia jack 5 . Steering wheel remote control(SWRC) 6 . Hands-free mic 7 . Roof antenna(Radio + GPS + DAB) Description and operation Description AVN system The AVN system simplifies system manipulation and by unifying the vehicle information and user information displays, improves information search and operation experience.Kia Stinger (CK) 2018-2023 Owner's Manual: Keep your vehicle clean
The best way to prevent corrosion is to keep your vehicle clean and free of corrosive materials. Attention to the underside of the vehicle is particularly important. If you live in a high-corrosion area — where road salts are used, near the ocean, areas with industrial pollution, acid rain, etc.—, you should take extra care to prevent corrosion.