Ebike voltage issues

What would you suggest from that link above 15ah or 17ah and do you think I would have to change the controller many thanks
 
Hi I have changed my controller for a 30a one and a larger battery a 13ah 30a continuously but no change still cutting out all the time , I get a error of 06 which flashes up quickly which is loss of voltage and then I get error 11 and keeps on running at full power with this error showing which is no connection to display, all connections have been checked they all look really good and strong , not sure what to say , but suppler is sending a new motor because that's the only thing that's not been changed we'll see many thanks
 
Hi I have changed for new motor still the same no change not sure what to do now other than change display and another controller and maybe pas sensor many thanks any ideas
 
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