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According to measurements from Lawrence Berkeley National Laboratory, the average cell phone draws 3.68 watts of power from the outlet while it's charging and 2.24 watts when charged.
you actually shouldn t as the yearly cost for charging your fancy toys including your iphone ipad and android devices is more than affordable according to forbes charging an ipad every day for a year will require 12kwh of electricity per year which will cost you a whopping $ 1 50 a smartphone with a 1440 mah battery will require 2000 watt hours of energy per year or 2kwh