I have absolutely no experience with SkyRC chargers, but maybe try to open the software first and then connect usb.
Maybe this works.

Could also be a faulty usb cable. For instance, some of my knock-off cheap micro usb cable will not charge my phone, however they are able to connect and charge other devices without any problem. When I use an original Samsung cable to charge my phone, everything goes well. So could also be your usb cable. It is worth trying different ones, if there is no other cause of your problems.