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How To: Reduce Battery Drain on Your Samsung Galaxy S3 by Fixing Android System Usage

The Jelly Bean update brought a lot of cool features to the Samsung Galaxy S3, but one nasty bug remained. Something was causing "Android System" usage to be consistently high. Of course, the percentage of this process that is used is dependent on what you're doing at any given time, but it shouldn't be anywhere near this level with "standard" use (calls, texts, emails, light browsing, etc.).