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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: Care of seat belts
Seat belt systems should never be disassembled or modified. In addition, care should be taken to assure that seat belts and belt hardware are not damaged by seat hinges, doors or other abuse. WARNING - Pinched seat belt Make sure that the webbing and/or buckle does not get caught or pinched in the rear seat when returning the rear seatback to its upright position.Kia Stinger (CK) 2018-2023 Owner's Manual: Integrated Body Control Unit (IBU)
Specifications Specifications Items Specifications Rated voltage DC 12 V Operating voltage DC 9 - 16 V Operating temperature -40 - 176°F (-40 - 80°C) Dark current Max. 4.0 mA Components and components location Components Connector Pin Information No.