I'm so glad I found this forum! We have the PowerBot 9350 and we get an error I cannot find anywhere, C 13. C 13 is not in the manual and nowhere on the internet. I haven't been able to get any response from Samsung. Does anyone know what this error means? Also, does anyone know how to manipulate the battery connectors to disconnect the battery completely from the powerbot? You can reply in German as my wife knows German. Thanks!