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2007, Sony demonstrated a Walkman that used a 'bio battery' - an organic battery that generates electricity by 'digesting' food, just like humans do.
But a new demonstration from the company shows off a much more useful product - battery that can 'digest' waste paper and turn it into energy.
The prototype - on show at Eco-Products 2011 in Tokyo, shows how it could be possible to use enzymes to 'break down' waste paper into a fuel we can use. The prototype generates enough energy to power a (very) small fan.
Sony demonstrated a battery that can 'digest' waste paper - turning rubbish into useful energy
The process is unlike conventional batteries - and initially at least, much more like the action of a digestive system.
A digestive enzyme, cellulase, 'breaks down' the cellulose in paper into glucose, a sugar that Sony's 'bio batteries' can use as fuel.
A digestive enzyme, cellulase, 'breaks down' the cellulose in paper into glucose, a sugar that Sony's 'bio batteries' can use as fuel
The company's bio batteries are now so advanced that the company showed off one thin enough to fit inside a greetings card alongside the paper-digesting battery.
It uses fruit juice for fuel, and can generate enough power to play a melody from inside the car.
As it stands, though, the 'paper-eating' battery can only generate a very small amount of power.
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