Ilo mp3 player won't turn on
Ok, SOME MP3/4 Players indeed charge from the USB port, albeit slowly... usually tho there comes a charger that plugs into the "Mains" and then plugs into the USB socket on the Player.. Sometimes if the Battery goes really "Flat" the USB port is unable to supplu enough "Current" sucessfully charge it up. (Hence the need for wall charger) IF it was entirely Via USB it would take many hours, I would at least think overnite. Hope that hepls.