Join Date: May 2014
Location: N. Central Florida
Mentioned: 1 Post(s)
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You need to go BACK to the dealer with the battery fully charged.....or almost so.....so they can find out what's wrong or explain the system to you better.
If that means that you need to leave it overnight so that THEY can charge it up, then so be it.
If that happens, they should provide you a loaner.
The USB port is not intended to be a "charging port" but an input/output data port.
A really LOT of devices out there now require a much higher charging capacity than the USB on the audio device can provide.
Sounds to me like you need to bring your own charger.
P.S. When the car is OFF, the USB port will be OFF too.
'17 Prius C-4