Electromagnetic harvester can charge your batteries from thin air – PC & Tech Authority.
“This tiny device will wirelessly suck up energy from power lines, coffee machines, photocopiers and pretty much anything else.”
“The harvester uses coils and high frequency diodes to capture the energy, while an LED indicates the strength of the signal. One thing to consider: Siegel says it takes about a day to charge a single AA battery, depending on the signal strength …”
paulspiece.com 