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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.
Page 28: Charge The Battery Charge the Battery Follow these instructions to charge your phoneâs battery using either the included charging head or via a USB connection on your computer. Charge Using the Charging Head 1. Plug the USB cable into the USB charger/accessory port on the bottom of your phone.