Re: Micro USB power/charging socket.
I suspect it probably uses a 12V charger, rather the current USB standard of 5V.
Roll on the new Type-C connector, and USB 3.1, as this includes USB PD (Power Delivery), which as well as 5V @ (up to) 2A, includes 12V @ 1.5A, 3A & 5A, plus 20V @ 3A and 5A.
So should be able to replace just about any charging requirements for any type of portable gadgets.