5,6V at idle - no device connected
250mA-1000mA charging current via battery monitor.
Came with samsung s4, had to replace due to broken ac plug pins (be careful, they easily brake)
5,1V at idle
Two first pictures are the fake one, last two are the original.
And if anybody wonders - you can't open it (original and fake) without damaging it - it's glued, best bet is to use a carpenter knife