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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: General Service Information
General information Identification Number Locations Protection of the Vehicle Always be sure to cover fenders, seats, and floor areas before servicing. Insert the supportive rod into the hole at the edge of the hood whenever inspecting the engine compartment to prevent the hood from falling and causing possible injury.Kia Stinger (CK) 2018-2023 Owner's Manual: Wireless smart phone charging system
A wireless smart phone charging system is located in front of the center console. Firmly close all doors, and turn the ignition to ACC or IGN ON. To start wireless charging, place the smart phone equipped with wireless charging function on the wireless charging pad. For best wireless charging results, place the smart phone on the center of the charging pad.