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Homemade “Crow’s Foot” Battery Capable of producing 2V, enough to charge a phone also you can wire them in parallel. Made from copper wire, zinc plate & copper sulphate solution which can be made easily enough by electrolysis from sulphuric acid. Full details : https://www.offthegridnews.com/extreme-survival/the-1800s-homemade-battery-you-may-need-during-a-collapse/amp