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: CVVT Oil Temperature Sensor (OTS)
Specifications Specification Temperature [°C (°F)] Resistance (kΩ) -40 52.15 -20 28.82 0 14.08 - 19.45 20 2.16 - 2.78 40 1.11 60 0.Kia Stinger (CK) 2018-2023 Owner's Manual: Electric Power Steering
Description and operation Description EPS (Electric power steering, Column assist type) system is an engine operation independent steering system that uses an electric motor to assist the steering force. EPS control module controls the motor operation based on input signals from torque sensor and steering angle sensor via CAN (Controller Area Network), resulting in a more precise and timely control of steering assist thatn conventional engine-driven hydraulic systems.