That charger looks perfectly alright for the reader. Although, there's always a slight risk involved with unofficial products. Charging is fine using the usb cable if you don't mind not being able to read while charging. Just leave it charging via the cable and forget it for many hours.
I'm not very sure about the transfer of books but i don't think calibre will differentiate which prs300 it's transferring to unless you have both plugged in at the same time.
|