You can connect the micro-USB port of the Tablet with the USB-port of the Keyboard. Then the tablet will be first dischared and afterward, you can deconnect and the tablet work with the battery of the keyboard. Not so elegant, but works.
Yes, it holds a charge and can be used by the tablet as a power source. Nothing, and I mean nothing that I have tried will get the tablet to recognize the keyboard in either Windows or Android, and I have done fresh installs of both…