InstructionsSolder the negative side (black) of the diode onto to the solar panel’s red wiring. . Put heat shrink tubing on.Solder some fresh wiring onto the diode’s positive side. . Twist the battery holder’s negative wire (black) onto the solar panel’s black wiring. . Get a USB charging circuit and find the + and – signs. . Glue everything inside a case. . You’re done. . [pdf]
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