Here's an energy source most of us haven't considered tapping: Wi-Fi wireless signals.

At CES 2010, RCA was showing a prototype of a handheld energy-harvesting battery designed to convert energy transmitted in a Wi-Fi signal into DC power, according to a report in OhGizmo.

The device, called the Airnergy, uses an antenna and circuitry to harvest the energy and an internal battery to store the electrical charge. A company representative told OhGizmo that they were able to charge a BlackBerry from 30 percent to full charge in about 90 minutes using the ambient Wi-Fi signal at CES, although the charge time varies depending on how close the battery is to the original signal.

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