I concur an interesting engineering post. But I do see a few problems like energy density (edit: I see you mentioned 1300 Whr/kg for aluminium compared to 160 Whr/kg for a Tesla Li Ion battery) and the fact that Aluminium takes huge amounts of electricity to produce. Having worked in an Aluminium smelter I can attest to that, the currents are so strong that the induced field near busbars exert noticeable force on steel cap boots as you walk!
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Of course with recycled Aluminium this is not an issue...