I suppose the charger's warranty is as long as the unit's .... one year.
Your unit ran out of power, not memory.
I would think your local Best Buy or similar sells replacement chargers.........
But before you consider that, are you sure the connections remained solid at both ends during the trip?
Charge your unit overnight with the usb connection. Tomorrow, connect the car charger to the unit again and see if the green light goes on.
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