Sitting in a prius for long periods of time?

So I m buying a 2015 prius two. I work for a ride sharing company and a lot of my shifts are at night and sometimes I sit for a couple hours without any calls. I listen to the radio, will the car alert me when the 12v battery is getting low? Should I sit with the car on? Do I have to be moving for the car to... show more So I m buying a 2015 prius two. I work for a ride sharing company and a lot of my shifts are at night and sometimes I sit for a couple hours without any calls. I listen to the radio, will the car alert me when the 12v battery is getting low? Should I sit with the car on? Do I have to be moving for the car to recharge the 12v battery or will it charge it sitting idle for 20 minutes or am I sol on listening to the radio once the 12v battery is low?
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