The app "battery left" is accurate after a few days... mine showed 17 Hrs with firmware 2.0 and now 25 Hrs with the 2.0.1... and I use the phone all day. A 5 Hour lifetime is a bit too short... you must have something that drains your battery fast (make a few changes in settings - brightness of screen - automatic, disable WIFI, GPS... and see if you have any luck.. if not... ask for a akku replace)
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Mario Nico 
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