I appreciate your views. Also, I would like to add that Aluminium (Al) Metal is equivalent to stored electricity since Al is produced by electrolysis of Alumina (Al2O3).
In India Indian Oil, &Hindustan Aluminium jointly with Israel’s Phinergy are carrying advanced research on development of Aluminium-Air Battery.
The research is in very advanced stage. Hopefully the Al-Air Battery will materialise soon.