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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.
Help for an IPhone That Will Not Charge Unless It is Turned Off Completely. The iPhone, like all smartphones and mobile devices, needs to be charged from time to time. Its battery life depends on what you use it for and how much you use it, but you should be able to rely on its ability to charge when you plug it in.attery Issues. While other smartphones allow you to remove and clean the battery, the iPhone isnât designed to be tampered with. Still, Apple maintains that the phone should charge whenever you connect that white USB cord (or plug the phone into a dock).