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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: Overhead Console Lamp
Repair procedures Inspection 1. Remove the overhead console lamp assembly then check for continuity between terminals. If the continuity is not as specified, replace the map lamp switch. Removal 1. Disconnect the negative (-) battery terminal. 2.1. Park on a level surface and apply the parking brake firmly. 2. Place the transaxle shift lever in P (Park). 3. Activate the hazard warning flashers. 4. Remove the wheel lug nut wrench, jack and spare tire from the vehicle. 5. Block both the front and rear of the wheel that is diagonally opposite from the jack position. WARNING - Jack location To reduce the possibility of injury, be sure to use only the jack provided with the vehicle in the correct jack position; never use any other part of the vehicle for jack support.