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My Iphone 5 has a black screen, I can hear incoming calls and battery volume but screen turned to black suddenly.
I've never heard anyone refer to that sound either. But it does make a sound when you plug a sleeping phone in to charge. I would call it a charge alert sound. ?Obviously this is not normal. If the reboot didn't work I would make a Genius Bar appointment at your nearest Apple store. By the way, I've never heard anyone say they can hear the battery volume. Good luck.
My Iphone 5 has a black screen, I can hear incoming calls and battery volume but screen turned to black suddenly.