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[quote user="erikem"] Note that technical feasibility is not the same as economic feasibility. - Erik <div style="clear:both;"></div> [/quote] Acknowledged. Those li-ion 18650 batteries ( 3,7V, 2400mAh ) in the tesla have an output of ~8,88Wh, each one costs ~6$. About 2 million of them have a potential output of 18MWh. But Tesla's battery-compartment with 6831cells weights already 450kg, a full car load of 150tons.  Otherwise: IF you cut the total output down to 9MWh, 4h running time AND use the 3600mAh cells ( 25$ per unit ), 750000 units may be capable enough and weight just 50tons. Yet, so far, such a battery compartment would cost 10 - 20Million $ alone.   Still, far away of being economic. -lars
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