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Make a diy battery charger with this simple $5 there are many situations when a diy emergency cellphone charger would save the aa batteries are 1.5. How to make a portable and rechargeable usb charger. put your 4 rechargeable aaa batteries into your battery how long will a phone charge on a 9 volt battery?. A tutorial showing how to make a portable, aa battery powered usb charger that is quick, easy and cheap to build. works with any usb powered device.
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