Build your own 1A+ 5V USB Charger with AA Batteries!

thingiverse

Yesterday, I created my own USB charger that accepts AA batteries with over 1A power using a spare cable, some solder, and a couple of 3D-printed parts. I utilized mrbenbritton's AA battery holder design (http://www.thingiverse.com/thing:132966) for its quick assembly and compact design. To use the charger, connect four batteries if they are 1.2V or three batteries if they are 1.5V, wired in series. This will work with most USB-powered devices, including Galaxy S3, Galaxy S4, and Google Glass. Before using the charger, verify your AA battery voltage, print the appropriate-sized battery holder from a customized http://www.thingiverse.com/thing:128069 or use the included 4xAA battery holder and block one slot if using 3xAA 1.5V batteries. While waiting for the printing, wire up the battery holder with solder, cut a female USB cable end, short the data lines (green and white), and connect the red and black wires to the battery holder. Finally, hot glue or adhere the USB female tip into the holder. If anyone has suggestions for an affordable source of solar panel and charging circuit, feel free to share.