There are a few indicators:
1 – On the home screen of the app look for the battery icon on the upper right side across from the word AIR PIX
2 – In camera mode, the icon is in the upper left-hand side of the screen, next to the WiFi signal.
The battery icon will show a portion of the battery in RED. This indicates the battery is low and need to be recharged.
When flying you will see the blue light start to flash, the flash pattern will be slow and steady.
The AIR PIX is designed to gently fly to the ground when the battery runs low.