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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 Keep your phone charged all the way when not in use. 2  Charge your phone every night if you use it a lot. 3  Turn your phone off when you don't need to use it. 4  Use an outlet instead of an USB.5  Studies show that an outlet charged up to 23% and the USB was only at 7%. 6  Turn it on airplane mode to charge faster.. Find a charger that fits your cell phone. They usually come with the phone. If you have lost yours, see if you have another one that works with your phone or go to the place you bought the phone and see about getting a new one.