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The controller only allow a specific battery because if it senses too high of a voltage it gives an error and doesn't work. So in the kits linked above, the customer would select the voltage package they want and the appropriate controller will be included.

That's amazing. I just ordered a BBS02 36V 500W rotor and stator. I can't wait to ride it with assist at my preferred cadence!

Deere John, I have a BBS01b and am very interested in increasing the maximum cadence to which it can assist. This is a brilliant solution! So is it really as simple as ordering a BBS02 500 W version rotor and stator, take off the old ones, and install the new ones? No complicated programming to...

I've had this motor for 2.5 years and it's worked very well. In the last few days it has been acting funny. Half the time I turn it on I get no assist. The display reads full battery voltage, but no assist. The other half of the times the assist will kick in. However, it's only providing about...

You said you can use long needle nose pliers to remove the axle locking nuts. Would that replace the special tool used in the above YouTube video at 1:02? (My BBS01b has been acting funny and I'm trying to figure out what tools I'll need to open it up)

Did you get to breaking down that motor? Find any signs of damage?

Thank you so much @1boris! That's exactly what I've been looking for.

I know. My BBS01b has it's max efficiency cadence at 80 rpm and no load cadence at 85 rpm. I use 155mm cranks and want to spin at 90 rpm regularly and 100 while climbing. The 48 volt BBS02 has max efficiency at around 110. I know the controller won't handle it. I was hoping someone know of a...

I have the same desire as the OP; I want to attach 48 volt batteries to my BBS01b. Unfortunately, this discussion has been off topic.