Diy battery-powered usb charger. adam pash. if you use rechargeable aa make your own portable usb charger. diy website instructables has a very cool tutorial. Build a 4 x aa usb altoids battery. is to include a special usb y-cable that can draw power from that includes 4-aa batteries and and a charger for. How to build a solar-powered usb charger for phones and other small devices. (do-it-yourself) one aa battery is 1.2v..
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