It currently only works for small appliances such as TV remote control but it's still early days. BBC:
The idea behind the technology is to remove the need for toxic rechargeable batteries and other disposable batteries that can harm the environment, said the company.
So far, two of the AA sized prototypes developed produce a voltage of 3.2V or lower, which is just enough to charge low power consumption device such as TV remote controls.
Despite the low power, Carl Telford an analyst at electronics business consultants Strategic Business Insights, says the batteries are a significant break through with much potential.
"It's great because they will work OK in a low-power application for AA batteries that one can shake without breaking; a remote control, for example," he told BBC News.
"Of its size, it is small, compact, and directly compatible with existing power sources. Brother says that it can produce enough power at reasonably low frequencies, around 4-8Hz - this is impressive.
