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: Inner panel fuse replacement
1. Turn the ignition switch and all other switches off. 2. Open the fuse panel cover. If the switch is located in the “OFF” position, a caution indicator will be displayed in the cluster. 3. Pull the suspected fuse straight out. Use the removal tool provided on the engine compartment fuse panel cover. 4. Check the removed fuse; replace it if it is blown.Repair procedures Inspection Radiator hoses 1. Check radiator hoses for the following (1) Improper attachment (2) Leaks (3) Cracks (4) Damage (5) Loose connections (6) Chafing (7) Deterioration Coolant level 1.