For everyone understand...
I have a specialized pitch pro with a bpm rear hub at 48v and 30A. Fidel did my battery, probably you know him from nova energia forum.
My friend has my former bike, a focus hardtail with a bbs02 500w 36v battery.
Yes...you have to go slow
I also own a enduro motorcycle ( i am a traitor) a ajp200...maybe thats closer in power to your build, but a reunion of electrics will be more fun