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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: Steering System
Repair procedures Service Adjustment Procedure Steering Wheel Play Inspection 1. Turn the steering wheel so that the front wheels are facing straight ahead. 2. Measure the distance that the steering wheel can be turned with out moving the front wheels. Standard value : 0 - 30mm (1.Kia Stinger (CK) 2018-2023 Owner's Manual: Check tire pressure
You can check the tire pressure in the information mode on the cluster. - Refer to “User settings mode” in chapter 4. Tire pressure is displayed 1~2 minutes later after driving. If tire pressure is not displayed when the vehicle is stopped, “Drive to display” message displays. After driving, check the tire pressure. You can change the tire pressure unit in the user settings mode on the cluster.