Computerworld - RCA showed a prototype of its Wi-Fi Hotspot Power Harvester called Airnergy that's designed to convert Wi-Fi radio signals into DC power for charging small wireless devices such as smartphones.
The small device called the Airnergy, is about 2 in. by 3 in. in size and is expected to sell for $39 to $49 this summer. RCA is working on a smaller version that would take the place of a battery inside a handheld device and would sell for around $59. That smaller version might ship in 2011, according to a demonstration at the 2010 International CES recorded on video by Geeky-Gadgets.com.
RCA officials could not be reached to confirm the details. According to a spokesman in the video demonstration, the device was able to charge a BlackBerry Bold with about 30% power in 90 minutes using a nearby Wi-Fi access point. The amount of charging time depends on a user's proximity to the Wi-Fi hot spot.
Demonstrations of wireless chargers have been a staple of CES for several years, and some products promised in 2008 have not materialized.
Some products, such as the Dell Latitude Z laptop, allow charging by placing the laptop directly on a wireless charging stand.
And Fulton Innovation LLC showed products and prototypes at CES. One Fulton technology concept powers a 12-watt light bulb from a transmitter placed 35 inches away.
Wireless charging could prove popular. Powermat USA showed new wireless charging mats for handheld computers at prices ranging from $39 to $149, and the company's CEO said Powermat has sold 750,000 devices since the company launched in the U.S. two months ago.
One blogger questioned why a charger would be needed, since a person within a hot spot might also be close enough to plug a device into a power outlet to recharge it. The usefulness of the device would depend partly on how close a user must be to the Wi-Fi access point, and whether a power outlet is available.
Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld. Follow Matt on Twitter at 
@matthamblen, send e-mail to mhamblen@computerworld.com or subscribe to Matt's RSS feed 
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