Contents:

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: Blind-Spot Collision Warning (BCW)
Specifications Specifications Items Specification Rated voltage DC 12 V Operating voltage 9 - 16 V Operating speed 30 - 255 km/h Sensing distance 30 m (Sedan) Curvature radius Start : Equal to or greater than 125 m Stop : Less than 125 m Frequency 24 GHz Quantity 2 EA (Master 1EA, Slave 1EA) Components and components location Components 1.Components and components location Components 1. Intake manifold 2. VCM actuator 3. Clip 4. VCM shaft 5. Intake manifold gasket 6. Intake manifold bracket (LH) 7. Intake manifold bracket (RH) Repair procedures Removal and Installation 1. Disconnect the negative battery terminal.