Bought my BBS02 with 17.5 AH batt abt two years ago. Works great except.... it seems to have a bit less power going up hills than during the first summer. First summer it was zooming up 10% grades. This summer it is struggling with a steep grade. I haven't put a lot of hours on it, and I am not an experienced bike mechanic. Is there a simple way to troubleshoot this WITHOUT taking controllers apart, etc.
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Battery. At least start there. Replace the battery with one with know high quality cells that have not been cycled. I have had a controller burn out and it is different from what you are describing I have also had a shit battery.. and it is a lot like what you are describing.