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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: Fuel Economy
Average Fuel Economy (1) The average fuel economy is calculated by the total driving distance and fuel consumption since the last average fuel economy reset. - Fuel economy range: 0.0 ~ 99.9 L/100km or MPG The average fuel economy can be reset both manually and automatically. ✽ NOTICE The fuel economy may vary significantly based on driving conditions, driving habits, and condition of the vehicle.Kia Stinger (CK) 2018-2023 Owner's Manual: Changing a tire with TPMS
If you have a flat tire, the Low Tire Pressure telltale will come on. Have the flat tire repaired by an authorized Kia dealer as soon as possible or replace the flat tire with the spare tire. CAUTION - Repair Agents Never use a puncture-repairing agent not approved by Kia to repair and/or inflate a low pressure tire. The sealant not approved by Kia may damage the tire pressure sensor.