Media is the media server scanning for pictures, music, ringtone and so on. A good place to start to try and fix this is your external sd card. Move things like pictures to a folder on your pc. And format the sd card. An fdr is not a bad idea either. There are old files on your internal memory that media searches through that keeps your phone awake, such as thumbnails and cache from wallpaper apps.
I cleaned out my entire phone this past weekend and I am getting awesome battery life now. Media is no longer a problem.
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