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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.
Nickel-based batteries should be charged for 16 hours initially and run through 2-4 full charge/full discharge cycles, while lithium ion batteries should be charged for about 5-6 hours. Ignore the phone telling you that the battery is fullâthis is normal but is not accurate if the battery is not initialized. Charging your phone on airplane mode could make your phone charge faster, depending on the type of charger used and the telephone's internal charging circuit. 2  If you're in no wifi area, turn off the wifi. 3  Go to Settings-General-Usage-Battery Usage and check what apps are killing you're battery.