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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: Recognizing pedestrians
The sensor may be limited when: - The pedestrian is not fully detected by the camera recognition system, for example, if the pedestrian is leaning over or is not fully walking upright - The pedestrian is moving very quickly or appears abruptly in the camera detection area - The pedestrian is wearing clothing that easily blends into the background, making it difficult to be detected by the camera recognition system - The outside lighting is too bright (e.Kia Stinger (CK) 2018-2023 Owner's Manual: Auto Lighting Control System
Specifications Specifications Items Specifications Rated voltage 5V Load Max. 1mA (Relay load) Illuminations (LUX) 50 0.98 ± 0.2 V 150 1.74 ± 0.38 V Components and components location Component Location 1.