My NH1 is bought in Japan,so it is a Japanese Version.And there is no usb plug in cradle,no external battery,too.
Since NH1 supports USB base power transforing files,I don't think the design of adding an usb plug on cradle is very important for me now.
About the external battery case,my NH1 supports approx 10H playing, I charg it almost everyday.Althoug it is not convenient,the player is 111g,heavy enough,put on a heavy external battery,it would be crazy for me to put into my pocket all the time.