I have a 4 month old Radcity 5+,  only 170km on it.  With fully charged battery, the left display shows one bar blinking above the battery indicator, then an Error 30, followed by power down.  Did all the checks Rad suggested and still nothing, so I suspect its the controller.  Having a hard time getting response from Rad, waited 3 weeks for emails asking for a video of the problem, which I just sent.

IF I have to go aftermarket route, where can I get a plug and play controller for a Radcity 5+?

Frank