Currently Being ModeratedNov 26, 2012 9:34 AM (in response to thaking325)
Not likely the battery. Apple glues the battery in place very securely, seriously beyond what is necessary. Even if the factory forgot the adhesive, the tight space tolerances of the case for the battery would not allow it to shift anyway. So what is loose, that you can hear when you shake the iPhone? Difficult to answer. Since this bothers you and could be something serious, make Genius reservation and take iPhone to Apple for evaluation. You are covered by full Warranty and Genius is trained to handle this type of problem.