First of all, you should make sure that you have correctly charged the device. If the Smart Ring battery is dead, it should be charged for approximately 24 hours before being installed and mounted. The optimum charge works with a 1.0A USB power adapter plugged into a wall outlet for 24 hours. Do not charge the Smart Ring with a laptop.
Note: Sometimes the current battery status is not displayed immediately after charging the Smart Ring. However, you can update it manually by briefly pressing (about 2 seconds) the Bluetooth button.