What do the different colors on the battery icon mean?
The battery icon in the top, left displays the charge level. If the color is:
Blue = displays level of charge.
Gray with "?" = no SatPaq has been selected.
Gray with "Z" = SatPaq is asleep.
Red = battery is very low and should be charged soon.
You can also tap the battery icon to view information about the SatPaq and SpaceLinq.