The MintyBoost kit from Adafruit Industries includes all the electronic parts necessary to build your own MintyBoost: a small & simple (but very powerful) USB charger for your iPod (or other mp3 player), camera, cell phone, and any other gadget you can plug into a USB port to charge.
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 USB charger! You can use rechargable batteries too.
Kit comes un-assembled and is suitable for beginners. Some soldering tools are necessary but even if you've never soldered before it should be pretty easy.
New In Version 3: Provides 500mA @ 5V, tested and designed to work with all the latest iGadgets including the latest iPhones and iPods, etc., improved efficiency for high-drain devices, works much better with LiPoly battery mods.
Tested works with: iPods, iTouches and iPhones (including the iPhone 4), PSP, DS..