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: Relay Box (Engine Compartment)
Components and components location Component Location E/R Junction Block (LHD - 1/2) Circuit (E/R Junction Block (LHD - 2/2) E/R Junction Block (RHD - 1/2) Circuit (E/R Junction Block (RHD - 2/2)) PCB Block Circuit (PCB Block) Diesel Junction Block (D4HB : R 2.Kia Stinger (CK) 2018-2023 Owner's Manual: Adaptive Front-Lighting System (AFS)
Specifications Specifications Content Value AFS Nominal Voltage DC 13.5V Max Voltage 16.5V Rated Voltage DC 9.5 - 16V Operating Temperature -22 to 167°F (-30 to 75°) Operating Current MAX.