Support Xperia U and various "quirks" - Help Please!

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http://androidforums.com – Morning all, I'm a newbie to this forum (even though I've been registered for quite a while), so please bear with me. First, let me explain that I've had dozens of Android handsets, as well as iPhones and various WP7/WP8 handsets too, so I don't consider myself to be a novice when it comes to battery saving etc. (anyone like me who had a HTC HD7 or HTC Desire HD will be well versed in how to save battery life!). I've recently bought a Sony Xperia U (purchased 10th Jan 2013). I charged it up to 100% yesterday, and within approximately 30 minutes of removing the charger, the battery l (General)