You (and Mr. Williams) really don't seem to grasp the orders-of-magnitude difference between what it takes to charge a cell phone battery and what you can reasonably expect to harvest in an average urban environment
Mmm.... Well call me crazy, am I crazy :/ but i wasn't on about RF, But on that subject:
I designed this device to capture radio waves, It gives me a constant 48V's @ 200ma Day and night 7 days a week (1 antenna) . 4 Antenna's can be attached to the device. increasing output. So its producing just under 10watts.
Here is a example,
"The iPhone 6 takes one hour 50 minutes using a 12 watt usb power adapter and the iPhone 6 Plus took 2 hours and 30 minutes. The iPhone 5, by comparison, took a similar amount of time to the iPhone 6"
The question id like to leave to you, is can radio waves charge a cell phone?.
But i will argue that radio-waves are not free sources of energy, so i am more for electrostatics.
Check me out @
http://empjammer.blogspot.co.uk/http://beambuilder.blogspot.co.uk/