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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.
On the other hand, electric vehicle charging costs are not nearly as clear. 1  Some EV charging stations require payment by the hour, dispensing however much energy the car can take during that time. 2  Others charge by the mysterious kilowatt-hour. 3  There are charging stations that use a per session fee.