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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.
5. Cancel. Charging a phone battery is most traditionally done by simply plugging in the phone charger to the phone, but there are also external battery chargers that can be used. Keep a cell phone battery charged up with helpful information from a cell phone specialist in this free video on cellular phones.here are two ways to do this. The easiest and simplest way and what everybody knows how to do is to plug your charger into the wall and then plug it into your phone, and it'll start charging right away. Now, this is kind of an industry secret, but there's a second way to charge your battery.