Android Phone help

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http://androidforums.com – So I bought and android phone and got 30% battery with it..I waited the phone to turn off and I charged it for the first time for 11 hours,and when I was checking it said battery is full,then I turned on te phone but it said 92%,and then I left it to charge to 100% why can't he charge to 100% when turned off??thanks in advance (General)