I counted 20 2A cells - 144WH.
There have been other examples of combining battery, controller and motor before, none met with much enthusiasm.
The idea is not very good, your wheel is a constant source of vibrations - subjecting batteries to vibration is stupid. The inertia of the electrodes and electrolyte will create stationary waves inside the batteries (like ocean waves) on top of G force, They will destroy the battery assembly prematurely.
I think it appeals to the couch potatoes. What else can you put in remote controls or smart phones?