Contents:

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: Parking Distance Warning (PDW)
Specifications Specification Item Specification Ultrasonic sensor Voltage rating DC 12 V Detecting range 11.8 - 47.2 in. (30 - 120 cm) Operation voltage DC 9 - 16 V Operation current MAX 80 mA Operation temperature -40 - 185°F (-40 - 85°C) Operation frequency 52 ± 2 KHz Number of sensors 8EA Components and components location Component Location 1.Repair procedures Removal Door Mirror Turn Signal Lamp 1. Disconnect the negative (-) battery terminal. 2. Remove the outside rear view mirror. (Refer to Body - "Outside Rear View Mirror") 3. Remove mirror (A) to the direction as shown in the picture using (-) screw driver.