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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.
If your iPhone wonât charge, there could be an issue with any of the three components involved with charging your iPhone: The wall adapter, the USB cable (either lightning or 30-pin, depending on which iPhone you own) or the charging port on your iPhone.âve seen plenty of misinformation on other websites about how handle an iPhone that wonât charge. Another article recommends replacing your iPhoneâs battery if it wonât charge, and as a former Apple technician, I can tell you that this is absolutely incorrect advice.