HOW DO I CHECK THE BATTERY LEVEL?
Press and Hold the "Rear" button
To check the battery, press and hold the “Rear” button for 3 seconds until the rear LEDs scroll once and then turn solid briefly. The number of LEDs solid indicates the battery level. All lights on means 100% charged, 1 light on means approximately 10%. The LEDs will then turn off automatically.
It is a quick indicator. If the LEDs remain on, then it is not the battery indicator and you need to hold the button longer.
On previous generations the charging indicator has a continuous scrolling pattern (opposite direction of the regular light function) which indicates the “percentage” of fully charged. All lights means 100%, 1 light means approximately 10%.