Low Battery??

A number of devices now exist to provide extra power to mobiles and wearables, such as power packs, mobile hand generators and solar cells. But although external power packs have become popular, they add size and weight, and mobile hand generators and solar cells produce only limited amounts of power.

Instead, an invention called PowerShake allows mobile and wearable devices to wirelessly charge other mobile and wearable devices on the go, even when those devices are being held or worn. Wireless-charging technologies are becoming more prevalent, but many of these stations are fixed, and do not account for devices near or in contact with skin.

The researchers experimented with a variety of power transmitter and receiver coils. They also devised electromagnetic shielding made of ferrite plates and copper tape on the back of coils in order to prevent any transmitted energy from reaching human tissue. They noted flexible coils were also possible, and potentially embeddable in watch straps.

In experiments, PowerShake fit into small devices, met wireless power transfer safety guidelines, and performed about as well at power transmission as commercial alternatives, such as the Qi wireless charging pad, transferring about 3.1 watts of power, the researchers said. They estimated that about 12 seconds of charging would support 1 minute of additional talk time, while 2 minutes of charging would support about 4 minutes of video watching.

For information check out LiveScience

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