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 System
Special service tools Special Service Tools Tool Name / Number Illustration Description Piston expander 09581-11000 Spreading the front disc brake piston Brake bleeding procedures Adjustment Brake System Bleeding • Do not reuse the drained fluid.Kia Stinger (CK) 2018-2023 Owner's Manual: Emergency fuel filler lid release
If the fuel filler lid does not open using the fuel filler lid opener button, you can open it manually. Remove the panel in the cargo area. Pull the handle out slightly. CAUTION Do not pull the handle excessively, otherwise the luggage area trim or release handle may be damaged. WARNING - Refueling Always remove the fuel cap carefully and slowly.