Sony Xperia Z Charging Dock Technical Question

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http://forum.xda-developers.com – Hi guys. I have a bit of a tech question in regards to the charging dock for my sony xperia z. I know how these smartphones can chew a lot of power and can go flat pretty quickly. so i charge the phone from a 240v power supply which has a 5v usb output rated at 2.1 amps. I know it charges faster than using the official charger which is rated at 1.5 amp as i have done my tests at work where i have the equipment to do so on my desk. I understand that it might reduce the life of the battery and probably not recommended as the battery is a lipo (kaboom). I haven't seen one docking statio (HowTos)