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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: When the lane ahead is clear
The vehicle speed will maintain the set speed. When there is a vehicle ahead of you in your lane The vehicle will maintain the set speed, when the lane ahead is clear. The vehicle will slow down or speed up within selected speed to maintain the selected distance, when there is a vehicle ahead of you in the lane. (A vehicle will appear in front of your vehicle in the LCD display only when there is an actual vehicle in front of you) If the vehicle ahead speeds up, your vehicle will travel at a steady cruising speed after accelerating to the selected speed.Components and components location Component Location 1. Rear door latch Repair procedures Replacement Put on gloves to protect your hands. • Use a plastic panel removal tool to remove interior trim pieces without marring the surface.