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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: Tail Gate
Repair procedures Adjustment 1. After loosening the tailgate hinge (A) mounting bolts, adjust the tailgate by moving it up and down, or right and left. 2. Adjust the tailgate height by turning the tailgate overslam bumpers (B). 3. After loosening the tailgate striker (C) mounting bolts, adjust the tailgate striker by moving it up and down, or right and left.Kia Stinger (CK) 2018-2023 Owner's Manual: Auto up/down window (Driver`s and Front Passenger’s side)
Pressing or pulling up the power window switch momentarily to the second detent position (6) completely lowers or raises the window even when the switch is released. To stop the window at the desired position while the window is in operation, pull up or press down and release the switch. If the power window does not operate normally, the automatic power window system must be reset as follows: 1.