It's not broken, it's that way by design. If you wish to change that, go ahead, but understand that you may completely drain your 12 volt auxiliary battery that way someday. (Granted, for a phone, that's not much of a risk.)
Note that there's no risk to the large high-voltage hybrid battery, as that is completely disconnected when the car is off. But if your 12 volt battery is dead, you'll need a jump to get going again (just like any other car).
Edit: Dear GE 90, You are accumulating "thumbs down" not because people don't believe you, but because your comments are irrelevant. Your dad's GMC has a 12 volt battery that probably has five times the capacity (or more) than the Prius battery. OF COURSE it can support a radio and a phone charger for many hours. The Prius 12 volt battery doesn't have to start a gasoline engine: It just starts COMPUTERS that then have the huge hybrid battery use the electric motor as a giant starter for the gasoline engine. When you answer questions involving a technology that you don't understand, you shouldn't be surprised when "thumbs down" is the result. (Yeah, now I've invited a few for myself...oh well.)
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