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Yep, yep, yep.
I agree with all that.
My concept here is assuming that you DONT have/ CANT Afford a higher voltage controller.
Having different cycling characteristics to the "spare" battery isn't an issue. That would just be charged up off a separate 12V charger.
I am also imagining a circumstance where a low-budget EV might need to travel a short section of higher speed road. Near me, it's all 25 mph roads except right outside my house, where it's 45, and it's a 55 mph zone just on the other side of the hill. A 48 volt controller, with a bypass to 60 or 72v would work great in that instance.
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