Supercapacitor prevents rebooting of FirTV attached to car 

I installed FirTV in my car, but it's annoying that it restarts even for a short time. For example, it restarts even if I just stop the engine at a convenience store.
So, I used an Aeon OFF timer to keep the power on for about 15 minutes even after the engine is turned off.
However, sometimes the voltage would drop when the starter motor was turned, causing the FirTV to restart.
Therefore, I tried to prevent the FirTV from restarting by using a supercapacitor.