Today, Tanga is offering the iPhone 5 Slim Rechargeable Extended Battery Case for only $19.99 shipped. With the Lightning Battery Case you can get up to 40 extra hours of audio and 13 extra hours of video playback, in addition to the battery life of your iPhone 5. Also, the battery case adds up to an additional 7 hours of talk time and 7 hours of Web browsing on 3G with your iPhone 5
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