I started this tread but forgot to tell my experience with PSW power.
I ordered the battery and centermotor mentioned on top.
I ordered it from Germany and it arived quite fast .
Tested the battery to 14,7 AH mounted the motor and it worked fine.
Bernt
Have anyone here used this Seller
https://www.pswpower.com/
It is very cheap Like this:
https://www.pswpower.com/products/rear-rack-electric-bicycle-battery-48v-10ah-li-ion-e-bike-battery-fits-48v-500w-bafang-tongsheng-tsdz2-246
I am aware the batter might have less AH.
And this...
This link might be better:
https://www.google.dk/search?q=Motor+26%22+p%C5%99edn%C3%AD+36V/250W+3pin/ov%C3%A1l+SY736+st%C5%99%C3%ADbrn%C3%BD&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwjqwtOptPTfAhVCa1AKHRlOCsoQsAR6BAgFEAE&biw=1474&bih=699#imgrc=19SKB8q808hFpM:&spf=1547714154296
But it seems to...
Here is a link Motor 26" přední 36V/250W 3pin/ovál SY736 stříbrný
It has no clutch freeweel. If it holds back try to disconnect the 3 wires from motor
Bernt