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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.
According to the companyâs study, it takes about about 10.5 watt-hours of electricity to fully charge the iPhone 6. Using the U.S. average retail price of electricity, which is 12.29 cents per kilowatt-hour, that means fully charging your iPhone 6 once each day for a full year will cost a total ofâ¦ $0.47. The iPhone 6 Plus needs a little more juice to fill its larger battery, and itâll cost you $0.52 per year as a result.