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The magnets only hold the stack of cells together, and tie the first cell to the second electrically. The demo has half a Dozen cells in series to make the 3 volt battery.
Likely each cell puts up about 0.5 volts. It is not rechargeable, since it is a primary battery. When the metal is consed, the battery dies.
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RE: Where will the batteries come from for the Californian's electric cars?