To check the battery level on your Brydge for Surface, locate and press the Battery Key on the keyboard.
The indicator light on the Delete/Power Key will now flash three times. The color of the light denotes the approximate battery level:
If the battery is lower than 9%, the keyboard backlighting will be disabled to conserve power and the light will flash red continuously.
You can also access the battery level directly from your Surface tablet by navigating to Settings >> Devices and scrolling down until you see your Brydge keyboard.
please note: Charging the Brydge can take up to three hours. When charging, the indicator light will remain solid red and turn off when charging has completed.