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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: Receiver-Drier
Repair procedures Replacement 1. Remove the condenser. 2. Remove the cap (B) from the bottom of the condenser using an L wrench (A). Tightening torque : 9.8 - 14.7 N·m (1.0 - 1.5 kgf·m, 7.2 - 10.8 lb·ft) 3. Remove the receiver-drier (A) from condenser using long nose pliers.Kia Stinger (CK) 2018-2023 Owner's Manual: Air Cleaner Filter
Repair procedures Inspection 1. Remove the air cleaner element. 2. Check that the air filter is excessively dirty. If the air filter is excessively dirty, replace the air cleaner element. 3. If the air cleaner element needs to be cleaned, blow compressed air as shown in the illustration to clean it.