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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.
Plug your smartphone into that longer cable and you can actually use it while itâs charging. You donât have to hunch over the table to use the phone. With a wireless charger, you would have to hunch over to use it while itâs charging. For example, letâs say you charge your smartphone on your bedside table.