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I was pokin around online and I found these external batteries that can power your Macbook or Macbook pro for up to 17 hours and theres also a USB port that can power iPhones or iTouch's or anything USB.
you can check them out at http://www.hypershop.com/HyperMac-External-MacBook-Battery-and-Car-Charger-s/91.htm
look really cool but they're definitely a bit pricy, anyone ever used these?
