Ring door bell 2nd Generation will not connect or Facrory reset

Hi we have a ring door bell 2nd Generation which was hard wired untill recently. the battery needed charging . I therefore took it off to charge however it will not now reconnect or do anything Factory reset does nothing. if i plog it into the USB i get a flashing full blue ring, as though it is full charged. When i check setting i cab see a full green battery icon (see image)  If I unplug it from the USB nothing happens when pushing the centre button or factory reset button any suggestions welcome