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: Climate Control Air Filter
Repair procedures Filter inspection The climate control air filter should be replaced according to the maintenance schedule. If the vehicle is operated in severely polluted city or on dusty rough roads for a long period, it should be inspected more frequently and replaced earlier than schedule. When replacing the climate control air filter, replace in the following procedure and be careful not to damage other components.Kia Stinger (CK) 2018-2023 Owner's Manual: Rear Glass Defogger
Components and components location Component Location 1. Integrated body control unit (IBU) 2. Rear glass defogger 3. Rear glass defogger switch