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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: P Position Solenoid Valve (ON/OFF)
Specifications Specifications Item Specification Control type ON/OFF Control pressure kpa (kgf/cm², psi) 539.36 (5.5, 78.23) Current (mA) 0 - 600 Coil resistance (Ω) 10.5 ± 0.5 Components and components location Components Location 1.Kia Stinger (CK) 2018-2023 Owner's Manual: Emission control system
The emission control system of your vehicle is covered by a written limited warranty. Please see the warranty information contained in the Warranty & Consumer Information manual in your vehicle. Your vehicle is equipped with an emission control system to meet all applicable emission regulations. There are three emission control systems, as follows.