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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.
assuming that the phone requires a full recharge every daymost do notand using the national average electricity price of $ 0 12 per kilowatt hour a smartphone will consume about $ 0 07 of electricity per month that s $ 1 68 over the course of a two year contract in other words it s probably not worth fretting over