The NODE-BT controller offers an easy way to check the battery health of the actual controller without the use of a smartphone.
Press the physical BATTERY CHECK BUTTON on NODE-BT controller and the battery indicator LED flashes green or red.
4 green blinks = 100% - 76% Excellent
3 green blinks = 75% - 51% Good
2 green blinks = 50% - 31% Low
1 green blink = 30 – 20% Poor
1 red blink = 0% - 19% (Replace 9V alkaline batteries)
NOTE: Version 0.78 controller firmware or higher is required, check using article here.