Well if it was me, I might mess up and hit the button by accident, if I was in the "learning" phase of using this device.
I think your basic idea is sound. If you had some additional way of controling the connection of the motor to the axle, then you might be able to recharge your batteries. Maybe you could sense manifold vacuum to detect coasting or slowdowns to to the engagement. There is something called a magnetic clutch that can be engaged or disengaged electrically. Then wire it up so you only try to charge ONE battery at a time, and make a selector so on the next slowdown the next battery gets charged.
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