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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.
Windows Phone charging via Qi hardware (image: Microsoft.com) 1  If thereâs one bit of transformational technology in the mobile world today, it is wireless charging. Just as the world got a hang of using microUSB to charge everything and anything (naturally excluding Apple), the next best thing came along.