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you could get an original battery for your iPhone 4, before you replace it you need read iPhone 4 Battery Installation Special Notes, and then fllowing the video of iPhone 4 Disassembly
Here is the guide for iPhone 4 Disassembly, you could do it as the steps, The iPhone 4 battery door include the back glass lens and inner plate, you also could buy the iPhone 4 back glass lens or battery door from somewhere else.