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: Side air bag
❈ The actual air bags in the vehicle may differ from the illustration. Your vehicle is equipped with a side air bag in each front seat. The purpose of the air bag is to provide the vehicle's driver and/or the front passenger with additional protection than that offered by the seat belt alone. The side air bags are designed to deploy during certain side-impact collisions, depending on the crash severity, angle, speed and point of impact.Kia Stinger (CK) 2018-2023 Owner's Manual: Engine Oil and Filter
Repair procedures Inspection [Theta-II 2.0 T-GDI / Lambda-II 3.3 T-GDI] Engine Oil Level Be sure that the vehicle is on level ground. 1. Warm up and stop the engine, and then wait for 5 minutes. 2. Turn the engine off and wait for a few minutes (about 5 minutes) for the oil to return to the oil pan.