Why my ipad 2 battery won't charged to 100 but only 50

Hi guys, I just bought my iPad 2 a month ago and now realized it that the battery life only 50 . It was 100 percent when I first charged . Then it dropped to 90 , 85, 75 NOW 50 . I bought my iPad with my dad but his iPad doesn't seem to have this problem .

Have you read this:
http://www.apple.com/batteries/ipad.html
Unless someone else has another idea, all I can suggest now is that you take your iPad to an Apple Service Center.

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