Hyundai Tucson (LM) 2010-2015 Owners Manual: Remote key precautions
The remote key will not work if any of the following occur:
The key is in the ignition switch.
You exceed the operating distance limit (about 30 m [90 feet]).
The remote key battery is weak.
Other vehicles or objects may be blocking the signal.
The weather is extremely cold.
The remote ...
Hyundai Tucson (LM) 2010-2015 Service Manual: Battery Components and Components Location
Components
1. Battery insulation pad2. Battery3. Battery tray4. Battery mounting bracket
...