My sky 1 crapped out as well. it has been so cloudy here, we haven't had any significant sun and the panel probably hasn't been able to keep up with the issue. I wish they would have on the app a warning, other than way at the bottom the icons.
Bring the camera in and put it on the charger, allow it to warm up as well. See if that makes a difference. Sometimes the battery depletes so deep that it can't recover.
Should that not revive it . CALL Bloomsky, and talk to a human. They are in California so you should try to grab them then. I find their form and email of little use. If it can't be fixed remotely, they will send you a replacement unit and you return the dead one.