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: Brake Booster
Components and components location Components 1. Master cylinder 2. Brake booster 3. Brake reservoir Repair procedures Brake Booster Operating Test For simple checking of the brake booster operation, carry out the following tests. 1. Run the engine for one to two minutes, and then stop it.Kia Stinger (CK) 2018-2023 Owner's Manual: Electronic Oil Pump (EOP)
Components and components location Components Location 1. Electric Oil Pump (EOP) Schematic diagrams Circuit Diagram Repair procedures Removal 1. Remove the under cover. (Refer to Engine Mechanical System - "Engine Room Under Cover") 2.