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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: Drive Belt
Repair procedures Removal 1. Remove the engine room front under cover. (Refer to Engine and Transmission Assembly - "Engine Room Under Cover") 2. For release the tension, turn the drive belt tensioner (A) counterclockwise then remove the drive belt (B). 3.Kia Stinger (CK) 2018-2023 Owner's Manual: Auto Lighting Control System
Specifications Specifications Items Specifications Rated voltage 5V Load Max. 1mA (Relay load) Illuminations (LUX) 50 0.98 ± 0.2 V 150 1.74 ± 0.38 V Components and components location Component Location 1.