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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: To keep locks from freezing
To keep the locks from freezing, squirt an approved de-icer fluid or glycerine into the key opening. If a lock is covered with ice, squirt it with an approved de-icing fluid to remove the ice. If the lock is frozen internally, you may be able to thaw it out by using a heated key. Handle the heated key with care to avoid injury. Use approved window washer anti-freeze in system To keep the water in the window washer system from freezing, add an approved window washer anti-freeze solution in accordance with instructions on the container.Kia Stinger (CK) 2018-2023 Owner's Manual: Lane Keeping Assist (LKA)
Components and components location Components 1. LKA ON/OFF switch 2. Instrument cluster 3. LKA Unit (MFC) * MFC : Multi Function Camera – Function : LKA,HBA,ISLW,FCW,SCC Description and operation Description System block diagram System function Camera unit of the LKA processes below function with the video signal inputted 1.