Why does my iphone 4s get hot?

My iphone gets quite hot from the back i bought the phone faulty from ebay, because it had a static/crackling noise but i fixed that i replaced the battery and its still getting hot but i think it has something to the black sticker if it is can you tell me because its coming from that area over the chip and the black thing is coming of please help

You might be blocking the fans at the bottom, i think

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