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: Rear View Monitor (RVM)
Components and components location Component Location 1. Rear view monitor (RVM) 2. AVN Monitor 3. Steering angle sensor Description and operation Description 1. To display back of the vehicle to assist the driver, it receives vehicle rearside image signal from the rear view monitor and displays it on AVN monitor or LHS of inside rearview mirror.Schematic diagrams Circuit Diagram Description and operation Description The multimedia jack on the console upper cover is for customers who like to listen to external portable music players like the MP3 etc., through the vehicle's sound system when it is linked to this jack. The customer has this added option.