A small battery-powered USB charger

Overview This project details a small & simple, but very powerful USB charger for your mp3 player, camera, cell phone, and just about any other gadget you can plug into a USB port to charge! (See below for compatibility tests.)

The charger circuitry and 2 AA batteries fit into an Altoids gum tin, and will run your iPod for hours! 2.5x more than you'd get from a 9V

Specifications:

Version 3 now works with iPhones and newer iGadgets! 5V output @ 500mA output Fits in your pocket Recharges just about any gadget with a USB cable Uses any AA batteries! Upgrade to C or D cells for a mega battery pack

Some numbers...

iPhone (all types): 3/4 full recharge iPod video (tested, using alkaline batteries): 3hrs more video (1 full recharge) iPod mini (tested w/rechargables): 26 hours more (1.5 full recharges) iPod nano: 4 full recharges! iPod shuffle : 60 hours more , 5 full recharges!

This project is suitable for beginners, some soldering tools are necessary but even if you've never soldered before it should be pretty easy.