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: Engine Control Module (ECM)
Schematic diagrams ECM Terminal And Input/Output signal ECM Terminal Function Connector [A] Terminal Description Connected to 1 - 2 - 3 - 4 - 5 Electric Waste Gate Actuator (EWGA) DC Motor output (-) Electric WasComponents and components location Component Location Front Seat Heater 1. Front seat heater unit (Assist seat only) 2. Front seat heater (Back) 3. Front seat heater (Cushion) Front Seat Heater (Air Ventilation) 1. Air ventilation seat unit (Assist seat only) 2.