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That junk metal is zinc and could be very useful to make batteries for your small electrical devices. You can actually peel the copper off and use the zinc in most any acid solution to make a battery cell. Combine cells until you have the proper voltage and the run parallel cells to provide the amperage needed. I have a couple of monitors that work from 12 volts at 3 amps and could easily be powered by such a battery.
 
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