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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: Snowy or icy conditions
To drive your vehicle in deep snow, it may be necessary to use Snow tires on your tires. If snow tires are needed, it is necessary to select tires equivalent in size and type of the original equipment tires. Failure to do so may adversely affect the safety and handling of your vehicle. Furthermore, speeding, rapid acceleration, sudden brake applications, and sharp turns are potentially very hazardous practices.Kia Stinger (CK) 2018-2023 Owner's Manual: Suspension System
Special service tools Special Service Tools Tool Name / Number Illustration Description Engine support fixture (bar) 09200-3N000 Used for holding engine assembly when removing / installing transaxle Used with the supporter (09200-2S100) Engine support fixture (supporter) 09200-2S100 Used for holding engine assembly when removing / installin