The RCA Airnergy WiFi Hotspot Power Harvester creates energy out of the air, at least if it’s in a WiFi zone. This amazing charger – featured at the recent CES 2010 in Las Vegas – “grabs” energy from a WiFi hot zone and converts it into electricity, while the internal battery charges itself. It can charge a Blackberry from 30% to 100% in around 90 minutes! And unlike solar chargers, it can charge itself even at night when in proximity to Wi-Fi. It’s free energy for any USB-powered device you plug it into.

Anticipated to launch this summer for around $40, the company plans to reduce the device’s size to cell phone battery size sometime next year. For around $60, that internal version would give you back-up battery capability so you’d never miss an important call.

This little box has, inside it, some kind of circuitry that harvests WiFi energy out of the air and converts it into electricity. This has been done before, but the Airnergy is able to harvest electricity with a high enough efficiency to make it practically useful: on the CES floor, they were able to charge a BlackBerry from 30% to full in about 90 minutes, using nothing but ambient WiFi signals as a power source.

Tags: gadget, usb, rca+airnergy+harvester, wifi+charger