The alarm will be activated if any of the following occurs while the system is armed.
The horn will sound and the hazard warning lights will blink continuously for approximately 27 seconds. To turn off the system, unlock the doors with the transmitter.
Kia Niro 2017 (DE HEV) Service Manual: Auxiliary 12V Battery Repair procedures
Removal
Auxiliary 12V Battery
1.
Open the trunk.
2.
Remove the luggage side trim [RH] side cover (A).
3.
Turn the ignition switch OFF and disconnect the battery negative (-)
terminal (A).
...
Kia Niro (DE HEV) Owners Manual: Smart key
To remove the mechanical key, press and hold the release button (1) and remove
the mechanical key (2).
To reinstall the mechanical key, put the key into the hole and push it until
a click sound is heard.
WARNING - Ignition key (smart key)
Leaving children unattended in a vehicle with the igni ...