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Kensington Battery Pack for iPod and iPhone
Need this, I use my phone so much, I have to charge it everyday.

Power and charge your iPhone or iPod on-the-go, and enjoy an extended playtime of up to 30 hours of music; 6 hours of video; or 3 hours of talk. The high-capacity, rechargeable Lithium-Ion Polymer battery pack is small and unobtrusive enough to keep connected to your iPhone or iPod while you’re using it.

The LED battery meter lets you visualize how much juice you have left, and the included retractable USB charging cable makes powering up the battery pack a snap. Backed by Kensington’s 1-year warranty
(credit: Swissmiss)