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.
top of page
bottom of page
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.
how many miles are on the kit would help to know. also things like regularly lubing the chain will reduce a lot of friction making it seem easier. bafangs are known to be reliable, so weakened power seems odd. it may be you are confused. or the battery could be losing capacity over time which may make it seem weaker. could be any number of things