This means that the camera grip has run out of battery and you need to recharge it when possible. The camera key remains operational for some time, so you can still use the phone's camera with the grip even though the battery is empty.
- Which tripods can I use with the camera grip?
- Why is one of the indicator lights blinking on the camera grip when I press the power indicator key?
- How can I get a secure hold of the phone when using the camera grip single-handedly?
- How much extra battery does the camera grip provide to my phone?
- How do I take photos using the camera grip?