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: Specifications
Service data Service Data Items Inner side Outer side Front driveshaft Joint type HUJ#26 WTJ#24 Max. permissible angle 28° 54° Rear driveshaft Joint type CGJ#26 CGJ#26 Max.Kia Stinger (CK) 2018-2023 Owner's Manual: Important - use of compact spare tire
Your vehicle is equipped with a compact spare tire. This compact spare tire takes up less space than a regular- size tire. This tire is smaller than a conventional tire and is designed for temporary use only. You should drive carefully when the compact spare is in use. The compact spare should be replaced by the proper conventional tire and rim at the first opportunity.