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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.
1 A good number of new phones have a cutoff feature that stops charging once it reaches 100 percent and has a 3 stage charging method these phones are safer to charge using power banks and even if it reaches 100 percent this feature stops further entry of current and helps to prevent damage to the battery. A good number of new phones have a cutoff feature that stops charging once it reaches 100 percent and has a 3 stage charging method these phones are safer to charge using power banks and even if it reaches 100 percent this feature stops further entry of current and helps to prevent damage to the battery.