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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: Transmission ranges
The indicator in the instrument cluster displays the shift lever position when the engine start/stop button is in the ON position. However, if the gear is in N (Neutral) or P (Park), the position is displayed on the instrument cluster when the engine start/stop button is in the OFF or ACC position. CAUTION - Transmission To avoid damage to your transmission, do not accelerate the engine in R (Reverse) or any forward gear position with the brakes on.Kia Stinger (CK) 2018-2023 Owner's Manual: Damper Clutch Control Solenoid Valve (D/C_VFS)
Specifications Specifications Item Specification Control type N/L (Normal Low) Control pressure kpa (kgf/cm², psi) 0 - 519.75 (0 - 5.3, 0 - 75.38) Current (mA) 0 - 850 Coil resistance (Ω) 5.