How Much Power To Charge A Cell Phone. Power bank capacity for 1 charge. Now with respect to cell phone charger wattage your cell phone charger uses about 20 kilowatt hours of energy but only if its plugged in.
3 - Lets assume the charger circuitry in your phone has 80 efficiency and the USB PSU 60. Most suggest the 20 80 rule which you can definitely follow. A Razr V3 cell phone uses 76V 800milliAmps for about 2 hours to become fully charged.
This may be much more realistic for the average person on a daily basis.
2 - Lets say you fully charge your phone every day. That means if you keep your smartphones battery charged up every day of the week it will cost you a total of 109 for the full year. Based on the average cost of electricity in the US charging current and duration of the average smart phone etc It comes to less than 50 cents p. It depends on your phones battery capacity.
