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Top iPhone 4 and 4S extended battery cases

by ZDNet Author  |  January 30, 2012 10:00am PST  |  Image 1 of 11

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Boost Case
Boost Case is one of the most popular battery cases out there because it's thin and has the "world's highest capacity" 1700 mAH battery in side. In other words, the battery's a little smaller and lighter but it still manages to double the battery life of your iPhone. The Boost Case Plus features a 2200 mAH battery for $10 more but doesn't seem as popular with users as this model.

Price: $52

See pricing for Boost Case from Amazon.com.

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