Thanks for the suggestion!  Ill look into that post and see if it offers any new options for me.

Had anyone found a solution to this issue?  I have a rad 6 bike that is exhibiting same problem.  Battery is fully charged (as indicated on battery itself) but controller shows empty.  As an additional clue, however, after a few seconds of turning on the bike an error 30 comes on the screen which Ive read indicates a communication issue.  Though I checked all connections, even plugged/unplugged them all, no resolution.  Frustrating as the bike is of course unusable in this state.