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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: Corrosion protection
Protecting your vehicle from corrosion By using the most advanced design and construction practices to combat corrosion, we produce vehicles of the highest quality. However, this is only part of the job. To achieve the long-term corrosion resistance your vehicle can deliver, the owner's cooperation and assistance is also required. Common causes of corrosion The most common causes of corrosion on your vehicle are: Road salt, dirt and moisture that is allowed to accumulate underneath the vehicle.Service data Service data Automatic Transmission Item Specification Transmission model A8LR1-1 Drive type 2WD / AWD Engine THETA ll 2.0 T-GDI (Gasoline) Clutch type Torque converter Oil pump type Internal gear Shift Lever type *SBW / *SBC Component elements