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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.
Cell phones use rechargeable lithium ion batteries. This type of battery can recharge 300 to 500 charge cycles to its full capacity before it will not charge fully. If your cell phone needs charging more often or the charge lasts for several hours less than when the battery was new, you may need a replacement battery. Testing the battery to obtain its capacity will tell you if a new battery is needed. Cell phone batteries eventually need replacing.